Train Random Forest classifier

Python implementation of Random Forest algorithm available in scikit-learn package is very popular. In this notebook, we will train Random Forest classifier. We will use Iris dataset, which presents mutliclass classification task.

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The outline of the notebook:

  • we load Iris dataset using Sample datasets recipe,
  • DataFrame is splitted to X and y using Select X,y recipe,
  • we create object of RandomForestClassifier and perform training in fit() function.
# import packages
import pandas as pd
from sklearn.ensemble import RandomForestClassifier
# load example dataset
df = pd.read_csv(
# display first rows
# create X columns list and set y column
x_cols = [
    "sepal length (cm)",
    "sepal width (cm)",
    "petal length (cm)",
    "petal widght (cm)",
y_col = "class"
# set input matrix
X = df[x_cols]
# set target vector
y = df[y_col]
# display data shapes
print(f"X shape is {X.shape}")
print(f"y shape is {y.shape}")
# initialize Random Forest
forest = RandomForestClassifier(
    n_estimators=100, criterion="gini", random_state=42, n_jobs=-1
# display model card
# fit model, y)


Python and scikit-learn make Random Forest training really easy. You need to have data prepared and split it into X and y. In this notebook, we assumed that we know hyperparameters values (for example, number of trees). In real life, you will need to optimize hyperparameters values for Random Forest to get the most accurate model response.

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