# Sentiment Classification & How To "Frame Problems" for a Neural Network

### What You Should Already Know

• neural networks, forward and back-propagation
• mean squared error
• and train/test splits

### Where to Get Help if You Need it

• Re-watch previous Udacity Lectures
• Leverage the recommended Course Reading Material - Grokking Deep Learning (40% Off: traskud17)
• Shoot me a tweet @iamtrask

### Tutorial Outline:

• Intro: The Importance of "Framing a Problem"
• Curate a Dataset
• Developing a "Predictive Theory"
• PROJECT 1: Quick Theory Validation
• Transforming Text to Numbers
• PROJECT 2: Creating the Input/Output Data
• Putting it all together in a Neural Network
• PROJECT 3: Building our Neural Network
• Understanding Neural Noise
• PROJECT 4: Making Learning Faster by Reducing Noise
• Analyzing Inefficiencies in our Network
• PROJECT 5: Making our Network Train and Run Faster
• Further Noise Reduction
• PROJECT 6: Reducing Noise by Strategically Reducing the Vocabulary
• Analysis: What's going on in the weights?

# Lesson: Curate a Dataset

``````

In [2]:

def pretty_print_review_and_label(i):
print(labels[i] + "\t:\t" + reviews[i][:80] + "...")

g = open('reviews.txt','r') # What we know!
g.close()

g = open('labels.txt','r') # What we WANT to know!
g.close()

``````
``````

In [3]:

len(reviews)

``````
``````

Out[3]:

25000

``````
``````

In [4]:

reviews[0]

``````
``````

Out[4]:

'bromwell high is a cartoon comedy . it ran at the same time as some other programs about school life  such as  teachers  . my   years in the teaching profession lead me to believe that bromwell high  s satire is much closer to reality than is  teachers  . the scramble to survive financially  the insightful students who can see right through their pathetic teachers  pomp  the pettiness of the whole situation  all remind me of the schools i knew and their students . when i saw the episode in which a student repeatedly tried to burn down the school  i immediately recalled . . . . . . . . . at . . . . . . . . . . high . a classic line inspector i  m here to sack one of your teachers . student welcome to bromwell high . i expect that many adults of my age think that bromwell high is far fetched . what a pity that it isn  t   '

``````
``````

In [5]:

labels[0]

``````
``````

Out[5]:

'POSITIVE'

``````

# Lesson: Develop a Predictive Theory

``````

In [6]:

print("labels.txt \t : \t reviews.txt\n")
pretty_print_review_and_label(2137)
pretty_print_review_and_label(12816)
pretty_print_review_and_label(6267)
pretty_print_review_and_label(21934)
pretty_print_review_and_label(5297)
pretty_print_review_and_label(4998)

``````
``````

labels.txt 	 : 	 reviews.txt

NEGATIVE	:	this movie is terrible but it has some good effects .  ...
POSITIVE	:	adrian pasdar is excellent is this film . he makes a fascinating woman .  ...
NEGATIVE	:	comment this movie is impossible . is terrible  very improbable  bad interpretat...
POSITIVE	:	excellent episode movie ala pulp fiction .  days   suicides . it doesnt get more...
NEGATIVE	:	if you haven  t seen this  it  s terrible . it is pure trash . i saw this about ...
POSITIVE	:	this schiffer guy is a real genius  the movie is of excellent quality and both e...

``````

# Project 1: Quick Theory Validation

``````

In [7]:

from collections import Counter
import numpy as np

``````
``````

In [8]:

positive_counts = Counter()
negative_counts = Counter()
total_counts = Counter()

``````
``````

In [9]:

for i in range(len(reviews)):
if(labels[i] == 'POSITIVE'):
for word in reviews[i].split(" "):
positive_counts[word] += 1
total_counts[word] += 1
else:
for word in reviews[i].split(" "):
negative_counts[word] += 1
total_counts[word] += 1

``````
``````

In [10]:

positive_counts.most_common()

``````
``````

Out[10]:

[('', 550468),
('the', 173324),
('.', 159654),
('and', 89722),
('a', 83688),
('of', 76855),
('to', 66746),
('is', 57245),
('in', 50215),
('br', 49235),
('it', 48025),
('i', 40743),
('that', 35630),
('this', 35080),
('s', 33815),
('as', 26308),
('with', 23247),
('for', 22416),
('was', 21917),
('film', 20937),
('but', 20822),
('movie', 19074),
('his', 17227),
('on', 17008),
('you', 16681),
('he', 16282),
('are', 14807),
('not', 14272),
('t', 13720),
('one', 13655),
('have', 12587),
('be', 12416),
('by', 11997),
('all', 11942),
('who', 11464),
('an', 11294),
('at', 11234),
('from', 10767),
('her', 10474),
('they', 9895),
('has', 9186),
('so', 9154),
('like', 9038),
('very', 8305),
('out', 8134),
('there', 8057),
('she', 7779),
('what', 7737),
('or', 7732),
('good', 7720),
('more', 7521),
('when', 7456),
('some', 7441),
('if', 7285),
('just', 7152),
('can', 7001),
('story', 6780),
('time', 6515),
('my', 6488),
('great', 6419),
('well', 6405),
('up', 6321),
('which', 6267),
('their', 6107),
('see', 6026),
('also', 5550),
('we', 5531),
('really', 5476),
('would', 5400),
('will', 5218),
('me', 5167),
('only', 5137),
('him', 5018),
('even', 4964),
('most', 4864),
('other', 4858),
('were', 4782),
('first', 4755),
('than', 4736),
('much', 4685),
('its', 4622),
('no', 4574),
('into', 4544),
('people', 4479),
('best', 4319),
('love', 4301),
('get', 4272),
('how', 4213),
('life', 4199),
('been', 4189),
('because', 4079),
('way', 4036),
('do', 3941),
('films', 3813),
('them', 3805),
('after', 3800),
('many', 3766),
('two', 3733),
('too', 3659),
('think', 3655),
('movies', 3586),
('characters', 3560),
('character', 3514),
('don', 3468),
('man', 3460),
('show', 3432),
('watch', 3424),
('seen', 3414),
('then', 3358),
('little', 3341),
('still', 3340),
('make', 3303),
('could', 3237),
('never', 3226),
('being', 3217),
('where', 3173),
('does', 3069),
('over', 3017),
('any', 3002),
('while', 2899),
('know', 2833),
('did', 2790),
('years', 2758),
('here', 2740),
('ever', 2734),
('end', 2696),
('these', 2694),
('such', 2590),
('real', 2568),
('scene', 2567),
('back', 2547),
('those', 2485),
('though', 2475),
('off', 2463),
('new', 2458),
('your', 2453),
('go', 2440),
('acting', 2437),
('plot', 2432),
('world', 2429),
('scenes', 2427),
('say', 2414),
('through', 2409),
('makes', 2390),
('better', 2381),
('now', 2368),
('work', 2346),
('young', 2343),
('old', 2311),
('ve', 2307),
('find', 2272),
('both', 2248),
('before', 2177),
('us', 2162),
('again', 2158),
('series', 2153),
('quite', 2143),
('something', 2135),
('cast', 2133),
('should', 2121),
('part', 2098),
('always', 2088),
('lot', 2087),
('another', 2075),
('actors', 2047),
('director', 2040),
('family', 2032),
('between', 2016),
('own', 2016),
('m', 1998),
('may', 1997),
('same', 1972),
('role', 1967),
('watching', 1966),
('every', 1954),
('funny', 1953),
('doesn', 1935),
('performance', 1928),
('few', 1918),
('look', 1900),
('re', 1884),
('why', 1855),
('things', 1849),
('times', 1832),
('big', 1815),
('however', 1795),
('actually', 1790),
('action', 1789),
('going', 1783),
('bit', 1757),
('comedy', 1742),
('down', 1740),
('music', 1738),
('must', 1728),
('take', 1709),
('saw', 1692),
('long', 1690),
('right', 1688),
('fun', 1686),
('fact', 1684),
('excellent', 1683),
('around', 1674),
('didn', 1672),
('without', 1671),
('thing', 1662),
('thought', 1639),
('got', 1635),
('each', 1630),
('day', 1614),
('feel', 1597),
('seems', 1596),
('come', 1594),
('done', 1586),
('beautiful', 1580),
('especially', 1572),
('played', 1571),
('almost', 1566),
('want', 1562),
('yet', 1556),
('give', 1553),
('pretty', 1549),
('last', 1543),
('since', 1519),
('different', 1504),
('although', 1501),
('gets', 1490),
('true', 1487),
('interesting', 1481),
('job', 1470),
('enough', 1455),
('our', 1454),
('shows', 1447),
('horror', 1441),
('woman', 1439),
('tv', 1400),
('probably', 1398),
('father', 1395),
('original', 1393),
('girl', 1390),
('point', 1379),
('plays', 1378),
('wonderful', 1372),
('far', 1358),
('course', 1358),
('john', 1350),
('rather', 1340),
('isn', 1328),
('ll', 1326),
('later', 1324),
('dvd', 1324),
('whole', 1310),
('war', 1310),
('d', 1307),
('found', 1306),
('away', 1306),
('screen', 1305),
('nothing', 1300),
('year', 1297),
('once', 1296),
('hard', 1294),
('together', 1280),
('set', 1277),
('am', 1277),
('having', 1266),
('making', 1265),
('place', 1263),
('might', 1260),
('comes', 1260),
('sure', 1253),
('american', 1248),
('play', 1245),
('kind', 1244),
('perfect', 1242),
('takes', 1242),
('performances', 1237),
('himself', 1230),
('worth', 1221),
('everyone', 1221),
('anyone', 1214),
('actor', 1203),
('three', 1201),
('wife', 1196),
('classic', 1192),
('goes', 1186),
('ending', 1178),
('version', 1168),
('star', 1149),
('enjoy', 1146),
('book', 1142),
('nice', 1132),
('everything', 1128),
('during', 1124),
('put', 1118),
('seeing', 1111),
('least', 1102),
('house', 1100),
('high', 1095),
('watched', 1094),
('loved', 1087),
('men', 1087),
('night', 1082),
('anything', 1075),
('believe', 1071),
('guy', 1071),
('top', 1063),
('amazing', 1058),
('hollywood', 1056),
('looking', 1053),
('main', 1044),
('definitely', 1043),
('gives', 1031),
('home', 1029),
('seem', 1028),
('episode', 1023),
('audience', 1020),
('sense', 1020),
('truly', 1017),
('special', 1011),
('second', 1009),
('short', 1009),
('fan', 1009),
('mind', 1005),
('human', 1001),
('recommend', 999),
('full', 996),
('black', 995),
('help', 991),
('along', 989),
('trying', 987),
('small', 986),
('death', 985),
('friends', 981),
('remember', 974),
('often', 970),
('said', 966),
('favorite', 962),
('heart', 959),
('early', 957),
('left', 956),
('until', 955),
('script', 954),
('let', 954),
('maybe', 937),
('today', 936),
('live', 934),
('less', 934),
('moments', 933),
('others', 929),
('brilliant', 926),
('shot', 925),
('liked', 923),
('become', 916),
('won', 915),
('used', 910),
('style', 907),
('mother', 895),
('lives', 894),
('came', 893),
('stars', 890),
('cinema', 889),
('looks', 885),
('perhaps', 884),
('enjoyed', 879),
('boy', 875),
('drama', 873),
('highly', 871),
('given', 870),
('playing', 867),
('use', 864),
('next', 859),
('women', 858),
('fine', 857),
('effects', 856),
('kids', 854),
('entertaining', 853),
('need', 852),
('line', 850),
('works', 848),
('someone', 847),
('mr', 836),
('simply', 835),
('picture', 833),
('children', 833),
('face', 831),
('keep', 831),
('friend', 831),
('dark', 830),
('overall', 828),
('certainly', 828),
('minutes', 827),
('wasn', 824),
('history', 822),
('finally', 820),
('couple', 816),
('against', 815),
('son', 809),
('understand', 808),
('lost', 807),
('michael', 805),
('else', 801),
('throughout', 798),
('fans', 797),
('city', 792),
('reason', 789),
('written', 787),
('production', 787),
('several', 784),
('school', 783),
('based', 781),
('rest', 781),
('try', 780),
('hope', 775),
('strong', 768),
('white', 765),
('tell', 759),
('itself', 758),
('half', 753),
('person', 749),
('sometimes', 746),
('past', 744),
('start', 744),
('genre', 743),
('beginning', 739),
('final', 739),
('town', 738),
('art', 734),
('humor', 732),
('game', 732),
('yes', 731),
('idea', 731),
('late', 730),
('becomes', 729),
('despite', 729),
('able', 726),
('case', 726),
('money', 723),
('child', 721),
('completely', 721),
('side', 719),
('camera', 716),
('getting', 714),
('soon', 702),
('under', 700),
('viewer', 699),
('age', 697),
('days', 696),
('stories', 696),
('felt', 694),
('simple', 694),
('roles', 693),
('video', 688),
('name', 683),
('either', 683),
('doing', 677),
('turns', 674),
('wants', 671),
('close', 671),
('title', 669),
('wrong', 668),
('went', 666),
('james', 665),
('evil', 659),
('budget', 657),
('episodes', 657),
('relationship', 655),
('fantastic', 653),
('piece', 653),
('david', 651),
('turn', 648),
('murder', 646),
('parts', 645),
('brother', 644),
('absolutely', 643),
('experience', 642),
('eyes', 641),
('sex', 638),
('direction', 637),
('called', 637),
('directed', 636),
('lines', 634),
('behind', 633),
('sort', 632),
('actress', 631),
('oscar', 628),
('including', 627),
('example', 627),
('known', 625),
('musical', 625),
('chance', 621),
('score', 620),
('feeling', 619),
('hit', 619),
('voice', 615),
('moment', 612),
('living', 612),
('low', 610),
('supporting', 610),
('ago', 609),
('themselves', 608),
('reality', 605),
('hilarious', 605),
('jack', 604),
('told', 603),
('hand', 601),
('quality', 600),
('moving', 600),
('dialogue', 600),
('song', 599),
('happy', 599),
('matter', 598),
('paul', 598),
('light', 594),
('future', 593),
('entire', 592),
('finds', 591),
('gave', 589),
('laugh', 587),
('released', 586),
('expect', 584),
('fight', 581),
('particularly', 580),
('cinematography', 579),
('police', 579),
('whose', 578),
('type', 578),
('sound', 578),
('view', 573),
('enjoyable', 573),
('number', 572),
('romantic', 572),
('husband', 572),
('daughter', 572),
('documentary', 571),
('self', 570),
('superb', 569),
('modern', 569),
('took', 569),
('robert', 569),
('mean', 566),
('shown', 563),
('coming', 561),
('important', 560),
('king', 559),
('leave', 559),
('change', 558),
('somewhat', 555),
('wanted', 555),
('tells', 554),
('events', 552),
('run', 552),
('career', 552),
('country', 552),
('heard', 550),
('season', 550),
('greatest', 549),
('girls', 549),
('etc', 547),
('care', 546),
('starts', 545),
('english', 542),
('killer', 541),
('tale', 540),
('guys', 540),
('totally', 540),
('animation', 540),
('usual', 539),
('miss', 535),
('opinion', 535),
('easy', 531),
('violence', 531),
('songs', 530),
('british', 528),
('says', 526),
('realistic', 525),
('writing', 524),
('writer', 522),
('act', 522),
('comic', 521),
('thriller', 519),
('television', 517),
('power', 516),
('ones', 515),
('kid', 514),
('york', 513),
('novel', 513),
('alone', 512),
('problem', 512),
('attention', 509),
('involved', 508),
('kill', 507),
('extremely', 507),
('seemed', 506),
('hero', 505),
('french', 505),
('rock', 504),
('stuff', 501),
('wish', 499),
('begins', 498),
('taken', 497),
('ways', 496),
('richard', 495),
('knows', 494),
('atmosphere', 493),
('similar', 491),
('surprised', 491),
('taking', 491),
('car', 491),
('george', 490),
('perfectly', 490),
('across', 489),
('team', 489),
('eye', 489),
('sequence', 489),
('room', 488),
('due', 488),
('among', 488),
('serious', 488),
('powerful', 488),
('strange', 487),
('order', 487),
('cannot', 487),
('b', 487),
('beauty', 486),
('famous', 485),
('happened', 484),
('tries', 484),
('herself', 484),
('myself', 484),
('class', 483),
('four', 482),
('cool', 481),
('release', 479),
('anyway', 479),
('theme', 479),
('opening', 478),
('entertainment', 477),
('slow', 475),
('ends', 475),
('unique', 475),
('exactly', 475),
('easily', 474),
('level', 474),
('o', 474),
('red', 474),
('interest', 472),
('happen', 471),
('crime', 470),
('viewing', 468),
('sets', 467),
('memorable', 467),
('stop', 466),
('group', 466),
('problems', 463),
('dance', 463),
('working', 463),
('sister', 463),
('message', 463),
('knew', 462),
('mystery', 461),
('nature', 461),
('bring', 460),
('believable', 459),
('thinking', 459),
('brought', 459),
('mostly', 458),
('disney', 457),
('couldn', 457),
('society', 456),
('within', 455),
('blood', 454),
('parents', 453),
('upon', 453),
('viewers', 453),
('meets', 452),
('form', 452),
('peter', 452),
('tom', 452),
('usually', 452),
('soundtrack', 452),
('local', 450),
('certain', 448),
('follow', 448),
('whether', 447),
('possible', 446),
('emotional', 445),
('killed', 444),
('above', 444),
('de', 444),
('god', 443),
('middle', 443),
('needs', 442),
('happens', 442),
('flick', 442),
('masterpiece', 441),
('period', 440),
('major', 440),
('named', 439),
('haven', 439),
('particular', 438),
('th', 438),
('earth', 437),
('feature', 437),
('stand', 436),
('words', 435),
('typical', 435),
('elements', 433),
('obviously', 433),
('romance', 431),
('jane', 430),
('yourself', 427),
('showing', 427),
('brings', 426),
('fantasy', 426),
('guess', 423),
('america', 423),
('unfortunately', 422),
('huge', 422),
('indeed', 421),
('running', 421),
('talent', 420),
('stage', 419),
('started', 418),
('sweet', 417),
('japanese', 417),
('poor', 416),
('deal', 416),
('incredible', 413),
('personal', 413),
('fast', 412),
('became', 410),
('deep', 410),
('hours', 409),
('giving', 408),
('nearly', 408),
('dream', 408),
('clearly', 407),
('turned', 407),
('obvious', 406),
('near', 406),
('cut', 405),
('surprise', 405),
('era', 404),
('body', 404),
('hour', 403),
('female', 403),
('five', 403),
('note', 399),
('learn', 398),
('truth', 398),
('except', 397),
('feels', 397),
('match', 397),
('tony', 397),
('filmed', 394),
('clear', 394),
('complete', 394),
('street', 393),
('eventually', 393),
('keeps', 393),
('older', 393),
('lots', 393),
('william', 391),
('stewart', 391),
('fall', 390),
('joe', 390),
('meet', 390),
('unlike', 389),
('talking', 389),
('shots', 389),
('rating', 389),
('difficult', 389),
('dramatic', 388),
('means', 388),
('situation', 386),
('wonder', 386),
('present', 386),
('appears', 386),
('subject', 386),
('general', 383),
('sequences', 383),
('lee', 383),
('points', 382),
('earlier', 382),
('gone', 379),
('check', 379),
('suspense', 378),
('recommended', 378),
('ten', 378),
('third', 377),
('talk', 375),
('leaves', 375),
('beyond', 375),
('portrayal', 374),
('beautifully', 373),
('single', 372),
('bill', 372),
('plenty', 371),
('word', 371),
('whom', 370),
('falls', 370),
('scary', 369),
('non', 369),
('figure', 369),
('battle', 369),
('using', 368),
('return', 368),
('doubt', 367),
('hear', 366),
('solid', 366),
('success', 366),
('jokes', 365),
('oh', 365),
('touching', 365),
('political', 365),
('hell', 364),
('awesome', 364),
('boys', 364),
('sexual', 362),
('recently', 362),
('dog', 362),
('wouldn', 361),
('straight', 361),
('features', 361),
('forget', 360),
('setting', 360),
('lack', 360),
('married', 359),
('mark', 359),
('social', 357),
('interested', 356),
('actual', 355),
('terrific', 355),
('sees', 355),
('brothers', 355),
('move', 354),
('call', 354),
('various', 353),
('theater', 353),
('dr', 353),
('animated', 352),
('western', 351),
('baby', 350),
('space', 350),
('disappointed', 348),
('portrayed', 346),
('aren', 346),
('screenplay', 345),
('smith', 345),
('towards', 344),
('hate', 344),
('noir', 343),
('outstanding', 342),
('decent', 342),
('kelly', 342),
('directors', 341),
('journey', 341),
('none', 340),
('looked', 340),
('effective', 340),
('storyline', 339),
('caught', 339),
('sci', 339),
('fi', 339),
('cold', 339),
('mary', 339),
('rich', 338),
('charming', 338),
('popular', 337),
('rare', 337),
('manages', 337),
('harry', 337),
('spirit', 336),
('appreciate', 335),
('open', 335),
('moves', 334),
('basically', 334),
('acted', 334),
('inside', 333),
('boring', 333),
('century', 333),
('mention', 333),
('deserves', 333),
('subtle', 333),
('pace', 333),
('familiar', 332),
('background', 332),
('ben', 331),
('creepy', 330),
('supposed', 330),
('secret', 329),
('die', 328),
('jim', 328),
('question', 327),
('effect', 327),
('natural', 327),
('impressive', 326),
('rate', 326),
('language', 326),
('saying', 325),
('intelligent', 325),
('telling', 324),
('realize', 324),
('material', 324),
('scott', 324),
('singing', 323),
('dancing', 322),
('visual', 321),
('imagine', 321),
('kept', 320),
('office', 320),
('uses', 319),
('pure', 318),
('wait', 318),
('stunning', 318),
('review', 317),
('previous', 317),
('copy', 317),
('seriously', 317),
('create', 316),
('hot', 316),
('created', 316),
('magic', 316),
('somehow', 316),
('stay', 315),
('attempt', 315),
('escape', 315),
('crazy', 315),
('air', 315),
('frank', 315),
('hands', 314),
('filled', 313),
('expected', 312),
('average', 312),
('surprisingly', 312),
('complex', 311),
('quickly', 310),
('successful', 310),
('studio', 310),
('plus', 309),
('male', 309),
('co', 307),
('images', 306),
('casting', 306),
('following', 306),
('minute', 306),
('exciting', 306),
('members', 305),
('follows', 305),
('themes', 305),
('german', 305),
('reasons', 305),
('e', 305),
('touch', 304),
('edge', 304),
('free', 304),
('cute', 304),
('genius', 304),
('outside', 303),
('reviews', 302),
('ok', 302),
('younger', 302),
('fighting', 301),
('odd', 301),
('master', 301),
('recent', 300),
('thanks', 300),
('break', 300),
('comment', 300),
('apart', 299),
('emotions', 298),
('lovely', 298),
('begin', 298),
('doctor', 297),
('party', 297),
('italian', 297),
('la', 296),
('missed', 296),
...]

``````
``````

In [11]:

pos_neg_ratios = Counter()

for term,cnt in list(total_counts.most_common()):
if(cnt > 100):
pos_neg_ratio = positive_counts[term] / float(negative_counts[term]+1)
pos_neg_ratios[term] = pos_neg_ratio

for word,ratio in pos_neg_ratios.most_common():
if(ratio > 1):
pos_neg_ratios[word] = np.log(ratio)
else:
pos_neg_ratios[word] = -np.log((1 / (ratio+0.01)))

``````
``````

In [12]:

# words most frequently seen in a review with a "POSITIVE" label
pos_neg_ratios.most_common()

``````
``````

Out[12]:

[('edie', 4.6913478822291435),
('paulie', 4.0775374439057197),
('felix', 3.1527360223636558),
('polanski', 2.8233610476132043),
('matthau', 2.8067217286092401),
('victoria', 2.6810215287142909),
('mildred', 2.6026896854443837),
('gandhi', 2.5389738710582761),
('flawless', 2.451005098112319),
('superbly', 2.2600254785752498),
('perfection', 2.1594842493533721),
('astaire', 2.1400661634962708),
('captures', 2.0386195471595809),
('voight', 2.0301704926730531),
('wonderfully', 2.0218960560332353),
('powell', 1.9783454248084671),
('brosnan', 1.9547990964725592),
('lily', 1.9203768470501485),
('bakshi', 1.9029851043382795),
('lincoln', 1.9014583864844796),
('refreshing', 1.8551812956655511),
('breathtaking', 1.8481124057791867),
('bourne', 1.8478489358790986),
('lemmon', 1.8458266904983307),
('delightful', 1.8002701588959635),
('flynn', 1.7996646487351682),
('andrews', 1.7764919970972666),
('homer', 1.7692866133759964),
('beautifully', 1.7626953362841438),
('soccer', 1.7578579175523736),
('elvira', 1.7397031072720019),
('underrated', 1.7197859696029656),
('gripping', 1.7165360479904674),
('superb', 1.7091514458966952),
('delight', 1.6714733033535532),
('welles', 1.6677068205580761),
('sinatra', 1.6389967146756448),
('touching', 1.637217476541176),
('timeless', 1.62924053973028),
('macy', 1.6211339521972916),
('unforgettable', 1.6177367152487956),
('favorites', 1.6158688027643908),
('stewart', 1.6119987332957739),
('sullivan', 1.6094379124341003),
('extraordinary', 1.6094379124341003),
('hartley', 1.6094379124341003),
('brilliantly', 1.5950491749820008),
('friendship', 1.5677652160335325),
('wonderful', 1.5645425925262093),
('palma', 1.5553706911638245),
('magnificent', 1.54663701119507),
('finest', 1.5462590108125689),
('jackie', 1.5439233053234738),
('ritter', 1.5404450409471491),
('tremendous', 1.5184661342283736),
('freedom', 1.5091151908062312),
('fantastic', 1.5048433868558566),
('terrific', 1.5026699370083942),
('noir', 1.493925025312256),
('sidney', 1.493925025312256),
('outstanding', 1.4910053152089213),
('pleasantly', 1.4894785973551214),
('mann', 1.4894785973551214),
('nancy', 1.488077055429833),
('marie', 1.4825711915553104),
('marvelous', 1.4739999415389962),
('excellent', 1.4647538505723599),
('ruth', 1.4596256342054401),
('stanwyck', 1.4412101187160054),
('widmark', 1.4350845252893227),
('splendid', 1.4271163556401458),
('chan', 1.423108334242607),
('exceptional', 1.4201959127955721),
('tender', 1.410986973710262),
('gentle', 1.4078005663408544),
('poignant', 1.4022947024663317),
('gem', 1.3932148039644643),
('amazing', 1.3919815802404802),
('chilling', 1.3862943611198906),
('fisher', 1.3862943611198906),
('davies', 1.3862943611198906),
('captivating', 1.3862943611198906),
('darker', 1.3652409519220583),
('april', 1.3499267169490159),
('kelly', 1.3461743673304654),
('blake', 1.3418425985490567),
('overlooked', 1.329135947279942),
('ralph', 1.32818673031261),
('bette', 1.3156767939059373),
('hoffman', 1.3150668518315229),
('cole', 1.3121863889661687),
('shines', 1.3049487216659381),
('powerful', 1.2999662776313934),
('notch', 1.2950456896547455),
('remarkable', 1.2883688239495823),
('pitt', 1.286210902562908),
('winters', 1.2833463918674481),
('vivid', 1.2762934659055623),
('gritty', 1.2757524867200667),
('giallo', 1.2745029551317739),
('portrait', 1.2704625455947689),
('innocence', 1.2694300209805796),
('psychiatrist', 1.2685113254635072),
('favorite', 1.2668956297860055),
('ensemble', 1.2656663733312759),
('stunning', 1.2622417124499117),
('burns', 1.259880436264232),
('garbo', 1.258954938743289),
('barbara', 1.2580400255962119),
('philip', 1.2527629684953681),
('panic', 1.2527629684953681),
('holly', 1.2527629684953681),
('carol', 1.2481440226390734),
('perfect', 1.246742480713785),
('appreciated', 1.2462482874741743),
('favourite', 1.2411123512753928),
('journey', 1.2367626271489269),
('rural', 1.235471471385307),
('bond', 1.2321436812926323),
('builds', 1.2305398317106577),
('brilliant', 1.2287554137664785),
('brooklyn', 1.2286654169163074),
('von', 1.225175011976539),
('recommended', 1.2163953243244932),
('unfolds', 1.2163953243244932),
('daniel', 1.20215296760895),
('perfectly', 1.1971931173405572),
('crafted', 1.1962507582320256),
('prince', 1.1939224684724346),
('troubled', 1.192138346678933),
('consequences', 1.1865810616140668),
('haunting', 1.1814999484738773),
('cinderella', 1.180052620608284),
('alexander', 1.1759989522835299),
('emotions', 1.1753049094563641),
('boxing', 1.1735135968412274),
('subtle', 1.1734135017508081),
('curtis', 1.1649873576129823),
('rare', 1.1566438362402944),
('loved', 1.1563661500586044),
('daughters', 1.1526795099383853),
('courage', 1.1438688802562305),
('dentist', 1.1426722784621401),
('highly', 1.1420208631618658),
('nominated', 1.1409146683587992),
('tony', 1.1397491942285991),
('draws', 1.1325138403437911),
('everyday', 1.1306150197542835),
('contrast', 1.1284652518177909),
('cried', 1.1213405397456659),
('fabulous', 1.1210851445201684),
('ned', 1.120591195386885),
('fay', 1.120591195386885),
('emma', 1.1184149159642893),
('sensitive', 1.113318436057805),
('smooth', 1.1089750757036563),
('dramas', 1.1080910326226534),
('today', 1.1050431789984001),
('helps', 1.1023091505494358),
('inspiring', 1.0986122886681098),
('jimmy', 1.0937696641923216),
('awesome', 1.0931328229034842),
('unique', 1.0881409888008142),
('tragic', 1.0871835928444868),
('intense', 1.0870514662670339),
('stellar', 1.0857088838322018),
('rival', 1.0822184788924332),
('provides', 1.0797081340289569),
('depression', 1.0782034170369026),
('shy', 1.0775588794702773),
('carrie', 1.076139432816051),
('blend', 1.0753554265038423),
('hank', 1.0736109864626924),
('diana', 1.0726368022648489),
('unexpected', 1.0722255334949147),
('achievement', 1.0668635903535293),
('bettie', 1.0663514264498881),
('happiness', 1.0632729222228008),
('glorious', 1.0608719606852626),
('davis', 1.0541605260972757),
('terrifying', 1.0525211814678428),
('beauty', 1.050410186850232),
('ideal', 1.0479685558493548),
('fears', 1.0467872208035236),
('hong', 1.0438040521731147),
('seasons', 1.0433496099930604),
('fascinating', 1.0414538748281612),
('carries', 1.0345904299031787),
('satisfying', 1.0321225473992768),
('definite', 1.0319209141694374),
('touched', 1.0296194171811581),
('greatest', 1.0248947127715422),
('creates', 1.0241097613701886),
('aunt', 1.023388867430522),
('walter', 1.022328983918479),
('spectacular', 1.0198314108149955),
('portrayal', 1.0189810189761024),
('ann', 1.0127808528183286),
('enterprise', 1.0116009116784799),
('musicals', 1.0096648026516135),
('deeply', 1.0094845087721023),
('incredible', 1.0061677561461084),
('mature', 1.0060195018402847),
('triumph', 0.99682959435816731),
('margaret', 0.99682959435816731),
('navy', 0.99493385919326827),
('harry', 0.99176919305006062),
('lucas', 0.990398704027877),
('sweet', 0.98966110487955483),
('joey', 0.98794672078059009),
('oscar', 0.98721905111049713),
('balance', 0.98649499054740353),
('warm', 0.98485340331145166),
('ages', 0.98449898190068863),
('guilt', 0.98082925301172619),
('glover', 0.98082925301172619),
('carrey', 0.98082925301172619),
('learns', 0.97881108885548895),
('unusual', 0.97788374278196932),
('sons', 0.97777581552483595),
('complex', 0.97761897738147796),
('essence', 0.97753435711487369),
('brazil', 0.9769153536905899),
('widow', 0.97650959186720987),
('solid', 0.97537964824416146),
('beautiful', 0.97326301262841053),
('holmes', 0.97246100334120955),
('awe', 0.97186058302896583),
('vhs', 0.97116734209998934),
('eerie', 0.97116734209998934),
('lonely', 0.96873720724669754),
('grim', 0.96873720724669754),
('sport', 0.96825047080486615),
('debut', 0.96508089604358704),
('destiny', 0.96343751029985703),
('thrillers', 0.96281074750904794),
('tears', 0.95977584381389391),
('rose', 0.95664202739772253),
('feelings', 0.95551144502743635),
('ginger', 0.95551144502743635),
('winning', 0.95471810900804055),
('stanley', 0.95387344302319799),
('cox', 0.95343027882361187),
('paris', 0.95278479030472663),
('heart', 0.95238806924516806),
('hooked', 0.95155887071161305),
('comfortable', 0.94803943018873538),
('mgm', 0.94446160884085151),
('masterpiece', 0.94155039863339296),
('themes', 0.94118828349588235),
('danny', 0.93967118051821874),
('anime', 0.93378388932167222),
('perry', 0.93328830824272613),
('joy', 0.93301752567946861),
('lovable', 0.93081883243706487),
('mysteries', 0.92953595862417571),
('hal', 0.92953595862417571),
('louis', 0.92871325187271225),
('charming', 0.92520609553210742),
('urban', 0.92367083917177761),
('allows', 0.92183091224977043),
('impact', 0.91815814604895041),
('italy', 0.91629073187415511),
('lifestyle', 0.91629073187415511),
('spy', 0.91289514287301687),
('treat', 0.91193342650519937),
('subsequent', 0.91056005716517008),
('kennedy', 0.90981821736853763),
('loving', 0.90967549275543591),
('surprising', 0.90937028902958128),
('quiet', 0.90648673177753425),
('winter', 0.90624039602065365),
('reveals', 0.90490540964902977),
('raw', 0.90445627422715225),
('funniest', 0.90078654533818991),
('norman', 0.89994159387262562),
('thief', 0.89874642222324552),
('season', 0.89827222637147675),
('secrets', 0.89794159320595857),
('colorful', 0.89705936994626756),
('highest', 0.8967461358011849),
('compelling', 0.89462923509297576),
('danes', 0.89248008318043659),
('castle', 0.88967708335606499),
('kudos', 0.88889175768604067),
('great', 0.88810470901464589),
('baseball', 0.88730319500090271),
('subtitles', 0.88730319500090271),
('bleak', 0.88730319500090271),
('winner', 0.88643776872447388),
('tragedy', 0.88563699078315261),
('todd', 0.88551907320740142),
('nicely', 0.87924946019380601),
('arthur', 0.87546873735389985),
('essential', 0.87373111745535925),
('gorgeous', 0.8731725250935497),
('fonda', 0.87294029100054127),
('eastwood', 0.87139541196626402),
('focuses', 0.87082835779739776),
('enjoyed', 0.87070195951624607),
('natural', 0.86997924506912838),
('intensity', 0.86835126958503595),
('witty', 0.86824103423244681),
('rob', 0.8642954367557748),
('worlds', 0.86377269759070874),
('health', 0.86113891179907498),
('magical', 0.85953791528170564),
('deeper', 0.85802182375017932),
('lucy', 0.85618680780444956),
('moving', 0.85566611005772031),
('lovely', 0.85290640004681306),
('purple', 0.8513711857748395),
('memorable', 0.84801189112086062),
('sings', 0.84729786038720367),
('craig', 0.84342938360928321),
('modesty', 0.84342938360928321),
('relate', 0.84326559685926517),
('episodes', 0.84223712084137292),
('strong', 0.84167135777060931),
('smith', 0.83959811108590054),
('tear', 0.83704136022001441),
('apartment', 0.83333115290549531),
('princess', 0.83290912293510388),
('disagree', 0.83290912293510388),
('kung', 0.83173334384609199),
('columbo', 0.82667857318446791),
('jake', 0.82667857318446791),
('hart', 0.82472353834866463),
('strength', 0.82417544296634937),
('realizes', 0.82360006895738058),
('dave', 0.8232003088081431),
('childhood', 0.82208086393583857),
('forbidden', 0.81989888619908913),
('tight', 0.81883539572344199),
('surreal', 0.8178506590609026),
('manager', 0.81770990320170756),
('dancer', 0.81574950265227764),
('studios', 0.81093021621632877),
('con', 0.81093021621632877),
('miike', 0.80821651034473263),
('realistic', 0.80807714723392232),
('explicit', 0.80792269515237358),
('kurt', 0.8060875917405409),
('deals', 0.80535917116687328),
('holds', 0.80493858654806194),
('carl', 0.80437281567016972),
('touches', 0.80396154690023547),
('gene', 0.80314807577427383),
('albert', 0.8027669055771679),
('abc', 0.80234647252493729),
('cry', 0.80011930011211307),
('sides', 0.7995275841185171),
('develops', 0.79850769621777162),
('eyre', 0.79850769621777162),
('dances', 0.79694397424158891),
('oscars', 0.79633141679517616),
('legendary', 0.79600456599965308),
('hearted', 0.79492987486988764),
('importance', 0.79492987486988764),
('portraying', 0.79356592830699269),
('impressed', 0.79258107754813223),
('waters', 0.79112758892014912),
('empire', 0.79078565012386137),
('edge', 0.789774016249017),
('jean', 0.78845736036427028),
('environment', 0.78845736036427028),
('sentimental', 0.7864791203521645),
('captured', 0.78623760362595729),
('styles', 0.78592891401091158),
('daring', 0.78592891401091158),
('frank', 0.78275933924963248),
('tense', 0.78275933924963248),
('backgrounds', 0.78275933924963248),
('matches', 0.78275933924963248),
('gothic', 0.78209466657644144),
('sharp', 0.7814397877056235),
('achieved', 0.78015855754957497),
('court', 0.77947526404844247),
('steals', 0.7789140023173704),
('rules', 0.77844476107184035),
('colors', 0.77684619943659217),
('reunion', 0.77318988823348167),
('covers', 0.77139937745969345),
('tale', 0.77010822169607374),
('rain', 0.7683706017975328),
('denzel', 0.76804848873306297),
('stays', 0.76787072675588186),
('blob', 0.76725515271366718),
('maria', 0.76214005204689672),
('conventional', 0.76214005204689672),
('fresh', 0.76158434211317383),
('midnight', 0.76096977689870637),
('landscape', 0.75852993982279704),
('animated', 0.75768570169751648),
('titanic', 0.75666058628227129),
('sunday', 0.75666058628227129),
('spring', 0.7537718023763802),
('cagney', 0.7537718023763802),
('enjoyable', 0.75246375771636476),
('immensely', 0.75198768058287868),
('sir', 0.7507762933965817),
('nevertheless', 0.75067102469813185),
('driven', 0.74994477895307854),
('performances', 0.74883252516063137),
('memories', 0.74721440183022114),
('simple', 0.74641420974143258),
('golden', 0.74533293373051557),
('leslie', 0.74533293373051557),
('lovers', 0.74497224842453125),
('relationship', 0.74484232345601786),
('supporting', 0.74357803418683721),
('che', 0.74262723782331497),
('packed', 0.7410032017375805),
('trek', 0.74021469141793106),
('provoking', 0.73840377214806618),
('strikes', 0.73759894313077912),
('depiction', 0.73682224406260699),
('emotional', 0.73678211645681524),
('secretary', 0.7366322924996842),
('influenced', 0.73511137965897755),
('florida', 0.73511137965897755),
('germany', 0.73288750920945944),
('brings', 0.73142936713096229),
('lewis', 0.73129894652432159),
('elderly', 0.73088750854279239),
('owner', 0.72743625403857748),
('streets', 0.72666987259858895),
('henry', 0.72642196944481741),
('portrays', 0.72593700338293632),
('bears', 0.7252354951114458),
('china', 0.72489587887452556),
('anger', 0.72439972406404984),
('society', 0.72433010799663333),
('available', 0.72415741730250549),
('best', 0.72347034060446314),
('bugs', 0.72270598280148979),
('magic', 0.71878961117328299),
('delivers', 0.71846498854423513),
('verhoeven', 0.71846498854423513),
('jim', 0.71783979315031676),
('donald', 0.71667767797013937),
('endearing', 0.71465338578090898),
('relationships', 0.71393795022901896),
('greatly', 0.71256526641704687),
('charlie', 0.71024161391924534),
('simon', 0.70967648251115578),
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('bridge', 0.43721380642274466),
('married', 0.43658501682196887),
('nazi', 0.4361020775700542),
('murder', 0.4353180712578455),
('physical', 0.4353180712578455),
('johnny', 0.43483971678806865),
('michelle', 0.43445264498141672),
('wallace', 0.43403848055222038),
('comedies', 0.43395706390247063),
('silent', 0.43395706390247063),
('played', 0.43387244114515305),
('international', 0.43363598507486073),
('vision', 0.43286408229627887),
('intelligent', 0.43196704885367099),
('shop', 0.43078291609245434),
('also', 0.43036720209769169),
('levels', 0.4302451371066513),
('miss', 0.43006426712153217),
('movement', 0.4295626596872249),
...]

``````
``````

In [13]:

# words most frequently seen in a review with a "NEGATIVE" label
list(reversed(pos_neg_ratios.most_common()))[0:30]

``````
``````

Out[13]:

[('boll', -4.0778152602708904),
('uwe', -3.9218753018711578),
('seagal', -3.3202501058581921),
('unwatchable', -3.0269848170580955),
('stinker', -2.9876839403711624),
('mst', -2.7753833211707968),
('incoherent', -2.7641396677532537),
('unfunny', -2.5545257844967644),
('waste', -2.4907515123361046),
('blah', -2.4475792789485005),
('horrid', -2.3715779644809971),
('pointless', -2.3451073877136341),
('atrocious', -2.3187369339642556),
('redeeming', -2.2667790015910296),
('prom', -2.2601040980178784),
('drivel', -2.2476029585766928),
('lousy', -2.2118080125207054),
('worst', -2.1930856334332267),
('laughable', -2.172468615469592),
('awful', -2.1385076866397488),
('poorly', -2.1326133844207011),
('wasting', -2.1178155545614512),
('remotely', -2.111046881095167),
('existent', -2.0024805005437076),
('boredom', -1.9241486572738005),
('miserably', -1.9216610938019989),
('sucks', -1.9166645809588516),
('uninspired', -1.9131499212248517),
('lame', -1.9117232884159072),
('insult', -1.9085323769376259)]

``````

# Transforming Text into Numbers

``````

In [14]:

from IPython.display import Image

review = "This was a horrible, terrible movie."

Image(filename='sentiment_network.png')

``````
``````

Out[14]:

``````
``````

In [15]:

review = "The movie was excellent"

Image(filename='sentiment_network_pos.png')

``````
``````

Out[15]:

``````

# Project 2: Creating the Input/Output Data

``````

In [16]:

vocab = set(total_counts.keys())
vocab_size = len(vocab)
print(vocab_size)

``````
``````

74074

``````
``````

In [17]:

list(vocab)

``````
``````

Out[17]:

['',
'pot',
'outback',
'reaffirms',
'recriminations',
'overboard',
'pube',
'yue',
'fairborn',
'mashing',
'hyper',
'hagan',
'southside',
'des',
'detraction',
'inconnu',
'creatures',
'selves',
'kliegs',
'coquettish',
'unrealistic',
'primed',
'horndogging',
'intrusive',
'formate',
'merest',
'thimig',
'tiangle',
'purifier',
'caleigh',
'unconfident',
'cahulawassee',
'urbania',
'sundownthe',
'psychos',
'sheeba',
'lashing',
'flavoring',
'metric',
'wheedle',
'compiled',
'enoch',
'dotty',
'peep',
'unethical',
'luminously',
'sloppier',
'syllabic',
'diffuses',
'kharis',
'kitrosser',
'uh',
'pornography',
'nutjobseen',
'lurk',
'ralphie',
'redo',
'shuddup',
'largest',
'calms',
'idyll',
'katre',
'variant',
'unscience',
'britt',
'nicotine',
'complementary',
'tossing',
'chandrmukhi',
'bleakest',
'remixed',
'karts',
'defibulator',
'nubes',
'puritanical',
'ctomvelu',
'garsh',
'evaluate',
'faridany',
'bourn',
'labourers',
'brunna',
'empurpled',
'dramatical',
'elucubrate',
'kidnap',
'patricide',
'demi',
'cleaning',
'renard',
'impersonator',
'huttner',
'redcoat',
'kiddos',
'ordeal',
'regal',
'satish',
'privacy',
'unburdened',
'volts',
'silents',
'ghim',
'accordance',
'morricones',
'smorsgabord',
'azema',
'economists',
'nerdy',
'repaired',
'godzillasaurus',
'finese',
'wsj',
'awstruck',
'paccino',
'instigated',
'rinaldo',
'universial',
'casing',
'propagandic',
'roshan',
'crowd',
'gallaghers',
'temps',
'thumbes',
'signed',
'piece',
'deepening',
'multicolored',
'atomspheric',
'reckons',
'kodak',
'lancre',
'ravens',
'conferred',
'ritualistic',
'unmelodious',
'gena',
'anurag',
'rue',
'frogging',
'penthouse',
'jones',
'brotherhood',
'bounce',
'burlesqued',
'rubell',
'treen',
'battleground',
'eddi',
'rebe',
'romans',
'mellon',
'inconvenienced',
'plastique',
'zering',
'rockies',
'burr',
'disillusion',
'upwards',
'mollified',
'springy',
'valli',
'undernourished',
'jugde',
'crewmate',
'butterface',
'mills',
'charlton',
'historyish',
'gabfests',
'choy',
'libertine',
'open',
'exciting',
'rubano',
'naschy',
'inspects',
'hm',
'hipness',
'chesticles',
'mannequins',
'mindgames',
'wished',
'eyeliner',
'prosero',
'fallowing',
'dreamland',
'default',
'counterpointing',
'soiree',
'wounded',
'berardinelli',
'bunk',
'vandenberg',
'nyberg',
'layla',
'outraged',
'signboard',
'chickboxer',
'lorraine',
'reeducation',
'satiating',
'feu',
'blurring',
'hhoorriibbllee',
'messier',
'trinket',
'stunts',
'lighter',
'reenactments',
'sneaking',
'vagueness',
'equalling',
'try',
'stirrings',
'fictitional',
'upbeat',
'djjohn',
'metroid',
'premise',
'thumping',
'fancifully',
'presages',
'asiaphile',
'campily',
'sk',
'teething',
'shaye',
'erwin',
'learnfrom',
'arnim',
'nose',
'campell',
'skyraiders',
'exiting',
'hlots',
'gallops',
'involve',
'hypnotically',
'sycophant',
'odder',
'camila',
'vrsel',
'incense',
'lagaan',
'metzger',
'propsdodgy',
'napkins',
'papamoskou',
'oo',
'autistic',
'godby',
'plonking',
'shoots',
'towers',
'sala',
'stuyvesant',
'baldrick',
'pursuing',
'physique',
'kana',
'modulate',
'groping',
'manghattan',
'jelled',
'values',
'picky',
'matured',
'sanctifying',
'kryptonite',
'aonn',
'outbreaking',
'dunns',
'porfirio',
'mikl',
'summerisle',
'negrophile',
'baggins',
'wmaq',
'conspiracy',
'yakusho',
'veto',
'meditative',
'freshest',
'positioning',
'campfire',
'gassed',
'mixed',
'sookie',
'pfifer',
'mott',
'impatiently',
'spools',
'leit',
'meningitis',
'theotocopulos',
'warnning',
'tilly',
'trini',
'spatially',
'ality',
'lethargically',
'lembach',
'wounder',
'impeccable',
'barantini',
'intransigent',
'differences',
'beth',
'approach',
'derring',
'bewitching',
'commentators',
'protagoness',
'set',
'aloysius',
'bernard',
'transmitter',
'heyward',
'reservoir',
'seized',
'divorces',
'anguish',
'servings',
'wantabedde',
'teddi',
'specifies',
'drum',
'cased',
'cambodian',
'hearsay',
'meditate',
'sitka',
'benson',
'mrs',
'decorous',
'mclaglen',
'vacuous',
'smelly',
'neurotoxic',
'pierre',
'carrys',
'preoccupation',
'subsidy',
'dimas',
'precociousness',
'faves',
'hefty',
'herding',
'dantesque',
'faye',
'pistols',
'affectations',
'flirting',
'montazuma',
'summation',
'noblemen',
'naturalizing',
'seuss',
'stygian',
'maclachalan',
'gaslight',
'cavemen',
'southron',
'archipelago',
'cloutish',
'calcifying',
'jennifers',
'candid',
'cartwheels',
'hellyou',
'silo',
'celeb',
'horts',
'ailment',
'expensive',
'futilely',
'quinton',
'bonds',
'penetrate',
'accentuate',
'vanning',
'mothballed',
'decorate',
'immobilize',
'unmated',
'netflix',
'goaul',
'immaterial',
'rejoiced',
'guerra',
'gamboling',
'hatching',
'guiding',
'dispatcher',
'negotiating',
'limousines',
'journos',
'moseys',
'jailhouse',
'singaporean',
'thimothy',
'astra',
'decorating',
'highlights',
'narrowly',
'casual',
'infiltration',
'habit',
'respondents',
'evacuee',
'transfuse',
'lavant',
'considers',
'externally',
'computers',
'herrmann',
'myerson',
'bratwurst',
'companys',
'orgolini',
'watase',
'midkiff',
'baiscally',
'arrivals',
'forceful',
'tidying',
'magnficiant',
'jogging',
'profession',
'emphasised',
'pee',
'lional',
'natwick',
'canuck',
'tasteful',
'giudizio',
'patrizio',
'shantytowns',
'maniac',
'bibbidi',
'sponge',
'diaper',
'hedgehog',
'placate',
'lustily',
'kilograms',
'hedrin',
'poundage',
'germs',
'gramm',
'gillian',
'leaver',
'whoville',
'baccalaurat',
'kremlin',
'invigorates',
'hater',
'brazen',
'vapor',
'trelkovski',
'spurred',
'ib',
'nghya',
'dithering',
'affective',
'crated',
'payout',
'rexas',
'select',
'withdrawn',
'utilizing',
'gerrard',
'complexities',
'reality',
'faculty',
'tedium',
'disintegrating',
'ur',
'unrequited',
'strumming',
'purest',
'divinity',
'newmar',
'aggrivating',
'acheived',
'ryszard',
'macabra',
'photographic',
'bling',
'paneled',
'molla',
'guidelines',
'thwarted',
'profiteering',
'zuni',
'fierceness',
'womanize',
'plessis',
'arteries',
'wanky',
'freeing',
'unleash',
'kebab',
'cursorily',
'tin',
'accommodations',
'clarinet',
'puddles',
'healthier',
'beleive',
'sedates',
'walters',
'jarman',
'barack',
'surrah',
'antiques',
'accidence',
'missie',
'qustions',
'cretin',
'nelligan',
'allo',
'coinciding',
'himesh',
'labyrinth',
'cheekily',
'overscaled',
'sprouts',
'hahah',
'monstro',
'flu',
'pleeeease',
'numerical',
'warfield',
'corporations',
'clanky',
'vats',
'soha',
'otoko',
'overrule',
'praying',
'untainted',
'hailstorm',
'figga',
'propagandizing',
'sappy',
'daffily',
'concept',
'crepe',
'johnstone',
'yor',
'muddy',
'star',
'guntenberg',
'karas',
'duda',
'amusing',
'isao',
'waffling',
'horrors',
'tighty',
'stephan',
'borowczyk',
'tsau',
'tamerlane',
'spectacle',
'cuisine',
'brulier',
'haven',
'enlivened',
'supurrrrb',
'trudie',
'zealousness',
'ointment',
'courtrooms',
'campions',
'clasping',
'transitions',
'squares',
'purge',
'bison',
'groggy',
'polished',
'tsunami',
'toreton',
'pill',
'engalnd',
'posy',
'harburg',
'jonbenet',
'widowed',
'form',
'geoffrey',
'consumingly',
'codeine',
'mobilized',
'dismember',
'nineveh',
'predictable',
'centerline',
'sow',
'blowtorch',
'jaclyn',
'gunshots',
'woulda',
'penguim',
'ammmmm',
'lehch',
'shallow',
'rin',
'sarte',
'jin',
'groundbraking',
'neenan',
'serpentine',
'vacuity',
'resist',
'guerillas',
'felonies',
'filmi',
'nez',
'blalack',
'impaling',
'unrecognisable',
'pickin',
'lure',
'titles',
'suitcases',
'zombielike',
'security',
'caricatured',
'arnies',
'feverishly',
'nyfiken',
'ceramics',
'unik',
'posturing',
'camion',
'lololol',
'verbose',
'unsurpassed',
'predigested',
'malformations',
'thi',
'jyotika',
'fakey',
'incapacitates',
'misogynistic',
'keyboards',
'acetylene',
'stamper',
'tech',
'overcame',
'prayer',
'lid',
'skimmed',
'overplayed',
'whistling',
'amps',
'telegraphing',
'mewing',
'playboy',
'camouflaged',
'knicker',
'mistrustful',
'roundup',
'fifths',
'militarized',
'outsides',
'mostey',
'sew',
'expressionism',
'tailored',
'careered',
'brie',
'meercats',
'snail',
'cheeseburgers',
'misfortune',
'controls',
'exalted',
'disseminated',
'meysels',
'canonical',
'seers',
'racking',
'collide',
'sculpture',
'illuminators',
'stimuli',
'agustin',
'frontyard',
'ghoulish',
'dennehy',
'wrongdoings',
'whiner',
'objections',
'gawkers',
'capomezza',
'pff',
'athena',
'pumpkins',
'jaja',
'unfound',
'heavily',
'pookie',
'precept',
'dunny',
'dirtiest',
'sporting',
'jot',
'kuchler',
'colorfully',
'alesia',
'horridly',
'horshack',
'surpasses',
'hangings',
'ruggedly',
'refute',
'ronet',
'chandleresque',
'matiss',
'suceed',
'intermittently',
'makeover',
'blachere',
'thawing',
'sofas',
'lout',
'devour',
'acquaintaces',
'boulanger',
'build',
'plains',
'deliveries',
'elixirs',
'beards',
'woodcourt',
'over',
'tel',
'talmud',
'doubting',
'barjatyagot',
'clich',
'construed',
'holdouts',
'psychotically',
'sleeps',
'profundity',
'polito',
'anthropomorphic',
'denouement',
'rainers',
'pampered',
'kazumi',
'tami',
'mcvay',
'gauge',
'squatting',
'circuited',
'toys',
'controlness',
'moti',
'descript',
'blanche',
'sleazebag',
'happy',
'borat',
'spewing',
'lucia',
'totalitarian',
'henshaw',
'jone',
'expectant',
'deille',
'flared',
'heartbreaking',
'achingly',
'misdemeanors',
'relationship',
'yomiuri',
'programme',
'defy',
'chagrined',
'disinformation',
'alwina',
'sudow',
'screenwriter',
'spats',
'christansan',
'islands',
'cinmas',
'kinnair',
'externalities',
'sikking',
'pouch',
'thid',
'hollywierd',
'renting',
'kidnapper',
'biangle',
'nail',
'gundams',
'milhalovitch',
'dedication',
'schlocky',
'tinge',
'lr',
'flyers',
'embezzler',
'enticing',
'thud',
'eaton',
'moderation',
'juicier',
'jettisoned',
'bebe',
'callipygian',
'jumbo',
'selective',
'fu',
'smithdale',
'flowerchild',
'newpaper',
'column',
'judah',
'automag',
'cannons',
'avon',
'medichlorians',
'lever',
'patient',
'kicha',
'fetuses',
'insufficiency',
'matrix',
'chastised',
'ewwww',
'peninsular',
'boundless',
'afrovideo',
'lifecycle',
'organ',
'muddling',
'sacrilegious',
'grasshopper',
'nallae',
'torchon',
'nikopol',
'rifkin',
'cowgirl',
'misfigured',
'soiler',
'mindless',
'maccullum',
'gaionsbourg',
'treasured',
'thesigner',
'lighted',
'sunniness',
'taverns',
'hrithek',
'fangirls',
'slopped',
'volume',
'romeo',
'sensibilities',
'snowbeast',
'crisi',
'malebranche',
'balloon',
'pawing',
'bacall',
'avoiding',
'forbids',
'produce',
'finney',
'physiques',
'screwy',
'troublemaker',
'unbeatableinspired',
'shihomi',
'jasna',
'ae',
'safiya',
'thurig',
'dewames',
'refreshes',
'abusers',
'pilling',
'fission',
'yaaay',
'paterfamilias',
'nandani',
'smartaleck',
'appliance',
'cowley',
'belen',
'trusted',
'almora',
'bogglingly',
'waive',
'crappily',
'mama',
'wotw',
'brak',
'supermoral',
'malignancy',
'lan',
'validation',
'edwina',
'bocanegra',
'suoi',
'jodoworsky',
'mauricio',
'stubbed',
'buuel',
'brazlia',
'unperturbed',
'seizes',
'divali',
'crissakes',
'slowdown',
'zeland',
'blowtorches',
'isabelwho',
'chawala',
'indicating',
'danson',
'dyslexic',
'fitz',
'nickelodeon',
'andi',
'braggin',
'compatibility',
'sakal',
'euphemistic',
'recommendations',
'mexico',
'malaga',
'bharat',
'neurologist',
'trifle',
'discounted',
'meshed',
'crossbows',
'condones',
'dodger',
'dens',
'interrupt',
'shouldn',
'boilerplate',
'cameos',
'ho',
'wangle',
'righting',
'churn',
'ithaca',
'hodges',
'fitzpatrick',
'caveman',
'quelle',
'dat',
'chamberlin',
'robin',
'overturn',
'toddlers',
'penalty',
'stimulated',
'breakaway',
'contaminating',
'fluid',
...]

``````
``````

In [18]:

import numpy as np

layer_0 = np.zeros((1,vocab_size))
layer_0

``````
``````

Out[18]:

array([[ 0.,  0.,  0., ...,  0.,  0.,  0.]])

``````
``````

In [19]:

from IPython.display import Image
Image(filename='sentiment_network.png')

``````
``````

Out[19]:

``````
``````

In [20]:

word2index = {}

for i,word in enumerate(vocab):
word2index[word] = i
word2index

``````
``````

Out[20]:

{'': 0,
'pot': 1,
'outback': 2,
'reaffirms': 3,
'recriminations': 4,
'overboard': 5,
'pube': 6,
'yue': 7,
'fairborn': 8,
'mashing': 9,
'hyper': 10,
'hagan': 12,
'southside': 13,
'des': 14,
'detraction': 15,
'inconnu': 16,
'creatures': 17,
'selves': 18,
'kliegs': 19,
'coquettish': 20,
'unrealistic': 21,
'primed': 22,
'horndogging': 23,
'intrusive': 24,
'formate': 25,
'merest': 26,
'thimig': 27,
'tiangle': 28,
'purifier': 29,
'caleigh': 30,
'unconfident': 31,
'cahulawassee': 32,
'urbania': 33,
'sundownthe': 34,
'psychos': 35,
'sheeba': 36,
'lashing': 37,
'flavoring': 38,
'metric': 39,
'wheedle': 40,
'compiled': 41,
'enoch': 42,
'dotty': 43,
'peep': 44,
'unethical': 45,
'luminously': 46,
'sloppier': 47,
'syllabic': 48,
'diffuses': 49,
'kharis': 50,
'kitrosser': 51,
'uh': 52,
'pornography': 53,
'nutjobseen': 54,
'lurk': 55,
'ralphie': 56,
'redo': 57,
'shuddup': 58,
'largest': 59,
'calms': 60,
'idyll': 61,
'katre': 62,
'variant': 63,
'unscience': 64,
'britt': 65,
'nicotine': 66,
'complementary': 67,
'tossing': 68,
'chandrmukhi': 69,
'bleakest': 70,
'remixed': 71,
'karts': 72,
'defibulator': 73,
'nubes': 74,
'puritanical': 75,
'ctomvelu': 76,
'garsh': 77,
'evaluate': 78,
'faridany': 79,
'bourn': 80,
'labourers': 81,
'brunna': 82,
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'dramatical': 84,
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'kidnap': 86,
'patricide': 87,
'demi': 88,
'cleaning': 89,
'renard': 90,
'impersonator': 91,
'huttner': 92,
'redcoat': 93,
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'regal': 96,
'satish': 97,
'privacy': 98,
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'volts': 100,
'silents': 101,
'ghim': 102,
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'morricones': 104,
'smorsgabord': 105,
'azema': 106,
'economists': 107,
'nerdy': 108,
'repaired': 109,
'godzillasaurus': 110,
'finese': 111,
'wsj': 112,
'awstruck': 113,
'paccino': 114,
'instigated': 115,
'rinaldo': 117,
'universial': 119,
'casing': 120,
'propagandic': 121,
'roshan': 122,
'crowd': 123,
'gallaghers': 124,
'temps': 125,
'thumbes': 126,
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'deepening': 130,
'multicolored': 131,
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'reckons': 133,
'kodak': 134,
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'ravens': 136,
'conferred': 137,
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'unmelodious': 139,
'gena': 140,
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'treen': 151,
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'rebe': 154,
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'mellon': 156,
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'mollified': 164,
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'skyraiders': 240,
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'metzger': 252,
'propsdodgy': 253,
'napkins': 254,
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'rejoiced': 400,
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'tin': 517,
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'puddles': 520,
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'sedates': 523,
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'barack': 526,
'surrah': 527,
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'accidence': 529,
'missie': 530,
'qustions': 531,
'cretin': 532,
'nelligan': 533,
'allo': 534,
'coinciding': 535,
'himesh': 536,
'labyrinth': 537,
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'sprouts': 540,
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'monstro': 542,
'flu': 543,
'pleeeease': 544,
'numerical': 545,
'warfield': 546,
'corporations': 547,
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'soha': 550,
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'sappy': 558,
'daffily': 559,
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'crepe': 561,
'johnstone': 562,
'yor': 563,
'muddy': 564,
'star': 565,
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'duda': 568,
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'tighty': 573,
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'tsau': 577,
'tamerlane': 578,
'spectacle': 579,
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'trudie': 585,
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'transitions': 591,
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'purge': 593,
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'tsunami': 597,
'toreton': 598,
'pill': 599,
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'posy': 601,
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'jonbenet': 603,
'widowed': 604,
'form': 605,
'geoffrey': 606,
'consumingly': 607,
'codeine': 608,
'mobilized': 609,
'dismember': 610,
'nineveh': 611,
'predictable': 612,
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'sow': 614,
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'jaclyn': 616,
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'ammmmm': 620,
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'pickin': 638,
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'titles': 640,
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'misogynistic': 661,
'keyboards': 662,
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'tech': 665,
'overcame': 666,
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'telegraphing': 673,
'mewing': 674,
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'mistrustful': 678,
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'fifths': 680,
'militarized': 681,
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'tailored': 686,
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'disseminated': 695,
'meysels': 696,
'canonical': 697,
'seers': 698,
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'collide': 700,
'sculpture': 701,
'illuminators': 702,
'stimuli': 703,
'agustin': 704,
'frontyard': 705,
'ghoulish': 706,
'dennehy': 707,
'wrongdoings': 708,
'whiner': 709,
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'gawkers': 711,
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'pff': 713,
'athena': 714,
'pumpkins': 715,
'jaja': 716,
'unfound': 717,
'heavily': 718,
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'dunny': 721,
'dirtiest': 723,
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'kuchler': 727,
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'matiss': 738,
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'kazumi': 773,
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'mcvay': 776,
'gauge': 777,
'squatting': 778,
'circuited': 779,
'toys': 780,
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'moti': 782,
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'lucia': 789,
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'henshaw': 792,
'jone': 793,
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'misdemeanors': 799,
'relationship': 800,
'yomiuri': 801,
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'disinformation': 805,
'alwina': 806,
'sudow': 807,
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'malebranche': 894,
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'smartaleck': 919,
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'cowley': 921,
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'mama': 928,
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'brak': 930,
'supermoral': 931,
'malignancy': 932,
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'validation': 934,
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'jodoworsky': 938,
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'seizes': 945,
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'slowdown': 948,
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'blowtorches': 950,
'isabelwho': 951,
'chawala': 952,
'indicating': 953,
'danson': 954,
'dyslexic': 955,
'fitz': 956,
'nickelodeon': 957,
'andi': 958,
'braggin': 960,
'compatibility': 961,
'sakal': 962,
'euphemistic': 963,
'recommendations': 964,
'mexico': 966,
'malaga': 967,
'bharat': 968,
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'trifle': 970,
'discounted': 971,
'meshed': 972,
'crossbows': 973,
'condones': 974,
'dodger': 975,
'dens': 976,
'interrupt': 977,
'shouldn': 978,
'boilerplate': 979,
'cameos': 980,
'ho': 981,
'wangle': 982,
'righting': 983,
'churn': 984,
'ithaca': 985,
'hodges': 986,
'fitzpatrick': 987,
'caveman': 988,
'quelle': 989,
'dat': 990,
'chamberlin': 991,
'robin': 992,
'overturn': 993,
'toddlers': 994,
'penalty': 995,
'stimulated': 996,
'breakaway': 997,
'contaminating': 998,
'fluid': 999,
...}

``````
``````

In [21]:

def update_input_layer(review):

global layer_0

# clear out previous state, reset the layer to be all 0s
layer_0 *= 0
for word in review.split(" "):
layer_0[0][word2index[word]] += 1

update_input_layer(reviews[0])

``````
``````

In [22]:

layer_0

``````
``````

Out[22]:

array([[ 18.,   0.,   0., ...,   0.,   0.,   0.]])

``````
``````

In [23]:

def get_target_for_label(label):
if(label == 'POSITIVE'):
return 1
else:
return 0

``````
``````

In [24]:

labels[0]

``````
``````

Out[24]:

'POSITIVE'

``````
``````

In [25]:

get_target_for_label(labels[0])

``````
``````

Out[25]:

1

``````
``````

In [26]:

labels[1]

``````
``````

Out[26]:

'NEGATIVE'

``````
``````

In [27]:

get_target_for_label(labels[1])

``````
``````

Out[27]:

0

``````

# Project 3: Building a Neural Network

• 3 layer neural network
• no non-linearity in hidden layer
• use our functions to create the training data
• create a "pre_process_data" function to create vocabulary for our training data generating functions
• modify "train" to train over the entire corpus

### Where to Get Help if You Need it

``````

In [28]:

import time
import sys
import numpy as np

# Let's tweak our network from before to model these phenomena
class SentimentNetwork:
def __init__(self, reviews,labels,hidden_nodes = 10, learning_rate = 0.1):

# set our random number generator
np.random.seed(1)

self.pre_process_data(reviews, labels)

self.init_network(len(self.review_vocab),hidden_nodes, 1, learning_rate)

def pre_process_data(self, reviews, labels):

review_vocab = set()
for review in reviews:
for word in review.split(" "):
self.review_vocab = list(review_vocab)

label_vocab = set()
for label in labels:

self.label_vocab = list(label_vocab)

self.review_vocab_size = len(self.review_vocab)
self.label_vocab_size = len(self.label_vocab)

self.word2index = {}
for i, word in enumerate(self.review_vocab):
self.word2index[word] = i

self.label2index = {}
for i, label in enumerate(self.label_vocab):
self.label2index[label] = i

def init_network(self, input_nodes, hidden_nodes, output_nodes, learning_rate):
# Set number of nodes in input, hidden and output layers.
self.input_nodes = input_nodes
self.hidden_nodes = hidden_nodes
self.output_nodes = output_nodes

# Initialize weights
self.weights_0_1 = np.zeros((self.input_nodes,self.hidden_nodes))

self.weights_1_2 = np.random.normal(0.0, self.output_nodes**-0.5,
(self.hidden_nodes, self.output_nodes))

self.learning_rate = learning_rate

self.layer_0 = np.zeros((1,input_nodes))

def update_input_layer(self,review):

# clear out previous state, reset the layer to be all 0s
self.layer_0 *= 0
for word in review.split(" "):
if(word in self.word2index.keys()):
self.layer_0[0][self.word2index[word]] += 1

def get_target_for_label(self,label):
if(label == 'POSITIVE'):
return 1
else:
return 0

def sigmoid(self,x):
return 1 / (1 + np.exp(-x))

def sigmoid_output_2_derivative(self,output):
return output * (1 - output)

def train(self, training_reviews, training_labels):

assert(len(training_reviews) == len(training_labels))

correct_so_far = 0

start = time.time()

for i in range(len(training_reviews)):

review = training_reviews[i]
label = training_labels[i]

#### Implement the forward pass here ####
### Forward pass ###

# Input Layer
self.update_input_layer(review)

# Hidden layer
layer_1 = self.layer_0.dot(self.weights_0_1)

# Output layer
layer_2 = self.sigmoid(layer_1.dot(self.weights_1_2))

#### Implement the backward pass here ####
### Backward pass ###

# TODO: Output error
layer_2_error = layer_2 - self.get_target_for_label(label) # Output layer error is the difference between desired target and actual output.
layer_2_delta = layer_2_error * self.sigmoid_output_2_derivative(layer_2)

# TODO: Backpropagated error
layer_1_error = layer_2_delta.dot(self.weights_1_2.T) # errors propagated to the hidden layer
layer_1_delta = layer_1_error # hidden layer gradients - no nonlinearity so it's the same as the error

# TODO: Update the weights
self.weights_1_2 -= layer_1.T.dot(layer_2_delta) * self.learning_rate # update hidden-to-output weights with gradient descent step
self.weights_0_1 -= self.layer_0.T.dot(layer_1_delta) * self.learning_rate # update input-to-hidden weights with gradient descent step

if(np.abs(layer_2_error) < 0.5):
correct_so_far += 1

reviews_per_second = i / float(time.time() - start)

sys.stdout.write("\rProgress:" + str(100 * i/float(len(training_reviews)))[:4] + "% Speed(reviews/sec):" + str(reviews_per_second)[0:5] + " #Correct:" + str(correct_so_far) + " #Trained:" + str(i+1) + " Training Accuracy:" + str(correct_so_far * 100 / float(i+1))[:4] + "%")
if(i % 2500 == 0):
print("")

def test(self, testing_reviews, testing_labels):

correct = 0

start = time.time()

for i in range(len(testing_reviews)):
pred = self.run(testing_reviews[i])
if(pred == testing_labels[i]):
correct += 1

reviews_per_second = i / float(time.time() - start)

sys.stdout.write("\rProgress:" + str(100 * i/float(len(testing_reviews)))[:4] \
+ "% Speed(reviews/sec):" + str(reviews_per_second)[0:5] \
+ "% #Correct:" + str(correct) + " #Tested:" + str(i+1) + " Testing Accuracy:" + str(correct * 100 / float(i+1))[:4] + "%")

def run(self, review):

# Input Layer
self.update_input_layer(review.lower())

# Hidden layer
layer_1 = self.layer_0.dot(self.weights_0_1)

# Output layer
layer_2 = self.sigmoid(layer_1.dot(self.weights_1_2))

if(layer_2[0] > 0.5):
return "POSITIVE"
else:
return "NEGATIVE"

``````
``````

In [29]:

mlp = SentimentNetwork(reviews[:-1000],labels[:-1000], learning_rate=0.1)

``````
``````

In [30]:

# evaluate our model before training (just to show how horrible it is)
mlp.test(reviews[-1000:],labels[-1000:])

``````
``````

Progress:99.9% Speed(reviews/sec):454.5% #Correct:500 #Tested:1000 Testing Accuracy:50.0%

``````
``````

In [62]:

# train the network
mlp.train(reviews[:-1000],labels[:-1000])

``````
``````

Progress:0.0% Speed(reviews/sec):0.0 #Correct:0 #Trained:1 Training Accuracy:0.0%
Progress:10.4% Speed(reviews/sec):89.58 #Correct:1250 #Trained:2501 Training Accuracy:49.9%
Progress:20.8% Speed(reviews/sec):95.03 #Correct:2500 #Trained:5001 Training Accuracy:49.9%
Progress:27.4% Speed(reviews/sec):95.46 #Correct:3295 #Trained:6592 Training Accuracy:49.9%

---------------------------------------------------------------------------
KeyboardInterrupt                         Traceback (most recent call last)
1 # train the network
----> 2 mlp.train(reviews[:-1000],labels[:-1000])

<ipython-input-59-6334c4ec4642> in train(self, training_reviews, training_labels)
117             # TODO: Update the weights
118             self.weights_1_2 -= layer_1.T.dot(layer_2_delta) * self.learning_rate # update hidden-to-output weights with gradient descent step
--> 119             self.weights_0_1 -= self.layer_0.T.dot(layer_1_delta) * self.learning_rate # update input-to-hidden weights with gradient descent step
120
121             if(np.abs(layer_2_error) < 0.5):

KeyboardInterrupt:

``````
``````

In [63]:

mlp = SentimentNetwork(reviews[:-1000],labels[:-1000], learning_rate=0.01)

``````
``````

In [64]:

# train the network
mlp.train(reviews[:-1000],labels[:-1000])

``````
``````

Progress:0.0% Speed(reviews/sec):0.0 #Correct:0 #Trained:1 Training Accuracy:0.0%
Progress:10.4% Speed(reviews/sec):96.39 #Correct:1247 #Trained:2501 Training Accuracy:49.8%
Progress:20.8% Speed(reviews/sec):99.31 #Correct:2497 #Trained:5001 Training Accuracy:49.9%
Progress:22.8% Speed(reviews/sec):99.02 #Correct:2735 #Trained:5476 Training Accuracy:49.9%

---------------------------------------------------------------------------
KeyboardInterrupt                         Traceback (most recent call last)
1 # train the network
----> 2 mlp.train(reviews[:-1000],labels[:-1000])

<ipython-input-59-6334c4ec4642> in train(self, training_reviews, training_labels)
117             # TODO: Update the weights
118             self.weights_1_2 -= layer_1.T.dot(layer_2_delta) * self.learning_rate # update hidden-to-output weights with gradient descent step
--> 119             self.weights_0_1 -= self.layer_0.T.dot(layer_1_delta) * self.learning_rate # update input-to-hidden weights with gradient descent step
120
121             if(np.abs(layer_2_error) < 0.5):

KeyboardInterrupt:

``````
``````

In [65]:

mlp = SentimentNetwork(reviews[:-1000],labels[:-1000], learning_rate=0.001)

``````
``````

In [66]:

# train the network
mlp.train(reviews[:-1000],labels[:-1000])

``````
``````

Progress:0.0% Speed(reviews/sec):0.0 #Correct:0 #Trained:1 Training Accuracy:0.0%
Progress:10.4% Speed(reviews/sec):98.77 #Correct:1267 #Trained:2501 Training Accuracy:50.6%
Progress:20.8% Speed(reviews/sec):98.79 #Correct:2640 #Trained:5001 Training Accuracy:52.7%
Progress:31.2% Speed(reviews/sec):98.58 #Correct:4109 #Trained:7501 Training Accuracy:54.7%
Progress:41.6% Speed(reviews/sec):93.78 #Correct:5638 #Trained:10001 Training Accuracy:56.3%
Progress:52.0% Speed(reviews/sec):91.76 #Correct:7246 #Trained:12501 Training Accuracy:57.9%
Progress:62.5% Speed(reviews/sec):92.42 #Correct:8841 #Trained:15001 Training Accuracy:58.9%
Progress:69.4% Speed(reviews/sec):92.58 #Correct:9934 #Trained:16668 Training Accuracy:59.5%

---------------------------------------------------------------------------
KeyboardInterrupt                         Traceback (most recent call last)
1 # train the network
----> 2 mlp.train(reviews[:-1000],labels[:-1000])

<ipython-input-59-6334c4ec4642> in train(self, training_reviews, training_labels)
117             # TODO: Update the weights
118             self.weights_1_2 -= layer_1.T.dot(layer_2_delta) * self.learning_rate # update hidden-to-output weights with gradient descent step
--> 119             self.weights_0_1 -= self.layer_0.T.dot(layer_1_delta) * self.learning_rate # update input-to-hidden weights with gradient descent step
120
121             if(np.abs(layer_2_error) < 0.5):

KeyboardInterrupt:

``````

# Understanding Neural Noise

``````

In [31]:

from IPython.display import Image
Image(filename='sentiment_network.png')

``````
``````

Out[31]:

``````
``````

In [70]:

def update_input_layer(review):

global layer_0

# clear out previous state, reset the layer to be all 0s
layer_0 *= 0
for word in review.split(" "):
layer_0[0][word2index[word]] += 1

update_input_layer(reviews[0])

``````
``````

In [71]:

layer_0

``````
``````

Out[71]:

array([[ 18.,   0.,   0., ...,   0.,   0.,   0.]])

``````
``````

In [79]:

review_counter = Counter()

``````
``````

In [80]:

for word in reviews[0].split(" "):
review_counter[word] += 1

``````
``````

In [81]:

review_counter.most_common()

``````
``````

Out[81]:

[('.', 27),
('', 18),
('the', 9),
('to', 6),
('i', 5),
('high', 5),
('is', 4),
('of', 4),
('a', 4),
('bromwell', 4),
('teachers', 4),
('that', 4),
('their', 2),
('my', 2),
('at', 2),
('as', 2),
('me', 2),
('in', 2),
('students', 2),
('it', 2),
('student', 2),
('school', 2),
('through', 1),
('insightful', 1),
('ran', 1),
('years', 1),
('here', 1),
('episode', 1),
('reality', 1),
('what', 1),
('far', 1),
('t', 1),
('saw', 1),
('s', 1),
('repeatedly', 1),
('isn', 1),
('closer', 1),
('and', 1),
('fetched', 1),
('remind', 1),
('can', 1),
('welcome', 1),
('line', 1),
('your', 1),
('survive', 1),
('teaching', 1),
('satire', 1),
('classic', 1),
('who', 1),
('age', 1),
('knew', 1),
('schools', 1),
('inspector', 1),
('comedy', 1),
('down', 1),
('pity', 1),
('m', 1),
('all', 1),
('see', 1),
('think', 1),
('situation', 1),
('time', 1),
('pomp', 1),
('other', 1),
('much', 1),
('many', 1),
('which', 1),
('one', 1),
('profession', 1),
('programs', 1),
('same', 1),
('some', 1),
('such', 1),
('pettiness', 1),
('immediately', 1),
('expect', 1),
('financially', 1),
('recalled', 1),
('tried', 1),
('whole', 1),
('right', 1),
('life', 1),
('cartoon', 1),
('scramble', 1),
('sack', 1),
('believe', 1),
('when', 1),
('than', 1),
('burn', 1),
('pathetic', 1)]

``````

# Project 4: Reducing Noise in our Input Data

``````

In [32]:

import time
import sys
import numpy as np

# Let's tweak our network from before to model these phenomena
class SentimentNetwork:
def __init__(self, reviews,labels,hidden_nodes = 10, learning_rate = 0.1):

# set our random number generator
np.random.seed(1)

self.pre_process_data(reviews, labels)

self.init_network(len(self.review_vocab),hidden_nodes, 1, learning_rate)

def pre_process_data(self, reviews, labels):

review_vocab = set()
for review in reviews:
for word in review.split(" "):
self.review_vocab = list(review_vocab)

label_vocab = set()
for label in labels:

self.label_vocab = list(label_vocab)

self.review_vocab_size = len(self.review_vocab)
self.label_vocab_size = len(self.label_vocab)

self.word2index = {}
for i, word in enumerate(self.review_vocab):
self.word2index[word] = i

self.label2index = {}
for i, label in enumerate(self.label_vocab):
self.label2index[label] = i

def init_network(self, input_nodes, hidden_nodes, output_nodes, learning_rate):
# Set number of nodes in input, hidden and output layers.
self.input_nodes = input_nodes
self.hidden_nodes = hidden_nodes
self.output_nodes = output_nodes

# Initialize weights
self.weights_0_1 = np.zeros((self.input_nodes,self.hidden_nodes))

self.weights_1_2 = np.random.normal(0.0, self.output_nodes**-0.5,
(self.hidden_nodes, self.output_nodes))

self.learning_rate = learning_rate

self.layer_0 = np.zeros((1,input_nodes))

def update_input_layer(self,review):

# clear out previous state, reset the layer to be all 0s
self.layer_0 *= 0
for word in review.split(" "):
if(word in self.word2index.keys()):
self.layer_0[0][self.word2index[word]] = 1

def get_target_for_label(self,label):
if(label == 'POSITIVE'):
return 1
else:
return 0

def sigmoid(self,x):
return 1 / (1 + np.exp(-x))

def sigmoid_output_2_derivative(self,output):
return output * (1 - output)

def train(self, training_reviews, training_labels):

assert(len(training_reviews) == len(training_labels))

correct_so_far = 0

start = time.time()

for i in range(len(training_reviews)):

review = training_reviews[i]
label = training_labels[i]

#### Implement the forward pass here ####
### Forward pass ###

# Input Layer
self.update_input_layer(review)

# Hidden layer
layer_1 = self.layer_0.dot(self.weights_0_1)

# Output layer
layer_2 = self.sigmoid(layer_1.dot(self.weights_1_2))

#### Implement the backward pass here ####
### Backward pass ###

# TODO: Output error
layer_2_error = layer_2 - self.get_target_for_label(label) # Output layer error is the difference between desired target and actual output.
layer_2_delta = layer_2_error * self.sigmoid_output_2_derivative(layer_2)

# TODO: Backpropagated error
layer_1_error = layer_2_delta.dot(self.weights_1_2.T) # errors propagated to the hidden layer
layer_1_delta = layer_1_error # hidden layer gradients - no nonlinearity so it's the same as the error

# TODO: Update the weights
self.weights_1_2 -= layer_1.T.dot(layer_2_delta) * self.learning_rate # update hidden-to-output weights with gradient descent step
self.weights_0_1 -= self.layer_0.T.dot(layer_1_delta) * self.learning_rate # update input-to-hidden weights with gradient descent step

if(np.abs(layer_2_error) < 0.5):
correct_so_far += 1

reviews_per_second = i / float(time.time() - start)

sys.stdout.write("\rProgress:" + str(100 * i/float(len(training_reviews)))[:4] + "% Speed(reviews/sec):" + str(reviews_per_second)[0:5] + " #Correct:" + str(correct_so_far) + " #Trained:" + str(i+1) + " Training Accuracy:" + str(correct_so_far * 100 / float(i+1))[:4] + "%")
if(i % 2500 == 0):
print("")

def test(self, testing_reviews, testing_labels):

correct = 0

start = time.time()

for i in range(len(testing_reviews)):
pred = self.run(testing_reviews[i])
if(pred == testing_labels[i]):
correct += 1

reviews_per_second = i / float(time.time() - start)

sys.stdout.write("\rProgress:" + str(100 * i/float(len(testing_reviews)))[:4] \
+ "% Speed(reviews/sec):" + str(reviews_per_second)[0:5] \
+ "% #Correct:" + str(correct) + " #Tested:" + str(i+1) + " Testing Accuracy:" + str(correct * 100 / float(i+1))[:4] + "%")

def run(self, review):

# Input Layer
self.update_input_layer(review.lower())

# Hidden layer
layer_1 = self.layer_0.dot(self.weights_0_1)

# Output layer
layer_2 = self.sigmoid(layer_1.dot(self.weights_1_2))

if(layer_2[0] > 0.5):
return "POSITIVE"
else:
return "NEGATIVE"

``````
``````

In [83]:

mlp = SentimentNetwork(reviews[:-1000],labels[:-1000], learning_rate=0.1)

``````
``````

In [84]:

mlp.train(reviews[:-1000],labels[:-1000])

``````
``````

Progress:0.0% Speed(reviews/sec):0.0 #Correct:0 #Trained:1 Training Accuracy:0.0%
Progress:10.4% Speed(reviews/sec):91.50 #Correct:1795 #Trained:2501 Training Accuracy:71.7%
Progress:20.8% Speed(reviews/sec):95.25 #Correct:3811 #Trained:5001 Training Accuracy:76.2%
Progress:31.2% Speed(reviews/sec):93.74 #Correct:5898 #Trained:7501 Training Accuracy:78.6%
Progress:41.6% Speed(reviews/sec):93.69 #Correct:8042 #Trained:10001 Training Accuracy:80.4%
Progress:52.0% Speed(reviews/sec):95.27 #Correct:10186 #Trained:12501 Training Accuracy:81.4%
Progress:62.5% Speed(reviews/sec):98.19 #Correct:12317 #Trained:15001 Training Accuracy:82.1%
Progress:72.9% Speed(reviews/sec):98.56 #Correct:14440 #Trained:17501 Training Accuracy:82.5%
Progress:83.3% Speed(reviews/sec):99.74 #Correct:16613 #Trained:20001 Training Accuracy:83.0%
Progress:93.7% Speed(reviews/sec):100.7 #Correct:18794 #Trained:22501 Training Accuracy:83.5%
Progress:99.9% Speed(reviews/sec):101.9 #Correct:20115 #Trained:24000 Training Accuracy:83.8%

``````
``````

In [85]:

# evaluate our model before training (just to show how horrible it is)
mlp.test(reviews[-1000:],labels[-1000:])

``````
``````

Progress:99.9% Speed(reviews/sec):832.7% #Correct:851 #Tested:1000 Testing Accuracy:85.1%

``````

# Analyzing Inefficiencies in our Network

``````

In [88]:

Image(filename='sentiment_network_sparse.png')

``````
``````

Out[88]:

``````
``````

In [89]:

layer_0 = np.zeros(10)

``````
``````

In [90]:

layer_0

``````
``````

Out[90]:

array([ 0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.,  0.])

``````
``````

In [91]:

layer_0[4] = 1
layer_0[9] = 1

``````
``````

In [92]:

layer_0

``````
``````

Out[92]:

array([ 0.,  0.,  0.,  0.,  1.,  0.,  0.,  0.,  0.,  1.])

``````
``````

In [93]:

weights_0_1 = np.random.randn(10,5)

``````
``````

In [94]:

layer_0.dot(weights_0_1)

``````
``````

Out[94]:

array([-0.10503756,  0.44222989,  0.24392938, -0.55961832,  0.21389503])

``````
``````

In [101]:

indices = [4,9]

``````
``````

In [102]:

layer_1 = np.zeros(5)

``````
``````

In [103]:

for index in indices:
layer_1 += (weights_0_1[index])

``````
``````

In [104]:

layer_1

``````
``````

Out[104]:

array([-0.10503756,  0.44222989,  0.24392938, -0.55961832,  0.21389503])

``````
``````

In [33]:

Image(filename='sentiment_network_sparse_2.png')

``````
``````

Out[33]:

``````
``````

In [ ]:

``````