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plot_example.py
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plot_example.py
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# coding: utf-8
import lightgbm as lgb
import pandas as pd
if lgb.compat.MATPLOTLIB_INSTALLED:
import matplotlib.pyplot as plt
else:
raise ImportError('You need to install matplotlib for plot_example.py.')
print('Loading data...')
# load or create your dataset
df_train = pd.read_csv('../regression/regression.train', header=None, sep='\t')
df_test = pd.read_csv('../regression/regression.test', header=None, sep='\t')
y_train = df_train[0]
y_test = df_test[0]
X_train = df_train.drop(0, axis=1)
X_test = df_test.drop(0, axis=1)
# create dataset for lightgbm
lgb_train = lgb.Dataset(X_train, y_train)
lgb_test = lgb.Dataset(X_test, y_test, reference=lgb_train)
# specify your configurations as a dict
params = {
'num_leaves': 5,
'metric': ('l1', 'l2'),
'verbose': 0
}
evals_result = {} # to record eval results for plotting
print('Starting training...')
# train
gbm = lgb.train(params,
lgb_train,
num_boost_round=100,
valid_sets=[lgb_train, lgb_test],
feature_name=['f' + str(i + 1) for i in range(X_train.shape[-1])],
categorical_feature=[21],
evals_result=evals_result,
verbose_eval=10)
print('Plotting metrics recorded during training...')
ax = lgb.plot_metric(evals_result, metric='l1')
plt.show()
print('Plotting feature importances...')
ax = lgb.plot_importance(gbm, max_num_features=10)
plt.show()
print('Plotting split value histogram...')
ax = lgb.plot_split_value_histogram(gbm, feature='f26', bins='auto')
plt.show()
print('Plotting 54th tree...') # one tree use categorical feature to split
ax = lgb.plot_tree(gbm, tree_index=53, figsize=(15, 15), show_info=['split_gain'])
plt.show()
print('Plotting 54th tree with graphviz...')
graph = lgb.create_tree_digraph(gbm, tree_index=53, name='Tree54')
graph.render(view=True)