Title: Recall
Slug: recall
Summary: How to evaluate a Python machine learning using recall.
Date: 2017-09-15 12:00
Category: Machine Learning
Tags: Model Evaluation
Authors: Chris Albon
Recall is the proportion of every positive observation that is truly positive. Recall measures the model's ability to identify a observation of the positive class. Models with high recall are optimistic in that they have a low-bar for predicting that an observation in the positive class.
$$\displaystyle \mathrm {Recall}=\frac {TP}{TP + FN}$$
In [1]:
# Load libraries
from sklearn.model_selection import cross_val_score
from sklearn.linear_model import LogisticRegression
from sklearn.datasets import make_classification
In [2]:
# Generate features matrix and target vector
X, y = make_classification(n_samples = 10000,
n_features = 3,
n_informative = 3,
n_redundant = 0,
n_classes = 2,
random_state = 1)
In [3]:
# Create logistic regression
logit = LogisticRegression()
In [4]:
# Cross-validate model using precision
cross_val_score(logit, X, y, scoring="recall")
Out[4]: