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867804bea1
In addition to ORTModule auto documentation during packaging, this PR also update golden numbers to fix CI
222 lines
6.5 KiB
Python
222 lines
6.5 KiB
Python
# Copyright (c) Microsoft Corporation. All rights reserved.
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# Licensed under the MIT License.
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"""
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.. _l-logreg-example:
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Train, convert and predict with ONNX Runtime
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============================================
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This example demonstrates an end to end scenario
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starting with the training of a machine learned model
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to its use in its converted from.
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.. contents::
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:local:
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Train a logistic regression
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+++++++++++++++++++++++++++
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The first step consists in retrieving the iris datset.
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"""
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from sklearn.datasets import load_iris
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iris = load_iris()
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X, y = iris.data, iris.target
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from sklearn.model_selection import train_test_split
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X_train, X_test, y_train, y_test = train_test_split(X, y)
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####################################
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# Then we fit a model.
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from sklearn.linear_model import LogisticRegression
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clr = LogisticRegression()
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clr.fit(X_train, y_train)
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####################################
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# We compute the prediction on the test set
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# and we show the confusion matrix.
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from sklearn.metrics import confusion_matrix
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pred = clr.predict(X_test)
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print(confusion_matrix(y_test, pred))
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####################################
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# Conversion to ONNX format
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# +++++++++++++++++++++++++
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#
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# We use module
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# `sklearn-onnx <https://github.com/onnx/sklearn-onnx>`_
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# to convert the model into ONNX format.
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from skl2onnx import convert_sklearn
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from skl2onnx.common.data_types import FloatTensorType
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initial_type = [('float_input', FloatTensorType([None, 4]))]
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onx = convert_sklearn(clr, initial_types=initial_type)
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with open("logreg_iris.onnx", "wb") as f:
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f.write(onx.SerializeToString())
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##################################
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# We load the model with ONNX Runtime and look at
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# its input and output.
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import onnxruntime as rt
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sess = rt.InferenceSession("logreg_iris.onnx")
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print("input name='{}' and shape={}".format(
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sess.get_inputs()[0].name, sess.get_inputs()[0].shape))
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print("output name='{}' and shape={}".format(
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sess.get_outputs()[0].name, sess.get_outputs()[0].shape))
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##################################
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# We compute the predictions.
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input_name = sess.get_inputs()[0].name
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label_name = sess.get_outputs()[0].name
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import numpy
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pred_onx = sess.run([label_name], {input_name: X_test.astype(numpy.float32)})[0]
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print(confusion_matrix(pred, pred_onx))
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###################################
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# The prediction are perfectly identical.
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#
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# Probabilities
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# +++++++++++++
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#
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# Probabilities are needed to compute other
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# relevant metrics such as the ROC Curve.
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# Let's see how to get them first with
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# scikit-learn.
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prob_sklearn = clr.predict_proba(X_test)
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print(prob_sklearn[:3])
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#############################
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# And then with ONNX Runtime.
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# The probabilies appear to be
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prob_name = sess.get_outputs()[1].name
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prob_rt = sess.run([prob_name], {input_name: X_test.astype(numpy.float32)})[0]
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import pprint
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pprint.pprint(prob_rt[0:3])
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###############################
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# Let's benchmark.
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from timeit import Timer
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def speed(inst, number=10, repeat=20):
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timer = Timer(inst, globals=globals())
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raw = numpy.array(timer.repeat(repeat, number=number))
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ave = raw.sum() / len(raw) / number
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mi, ma = raw.min() / number, raw.max() / number
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print("Average %1.3g min=%1.3g max=%1.3g" % (ave, mi, ma))
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return ave
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print("Execution time for clr.predict")
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speed("clr.predict(X_test)")
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print("Execution time for ONNX Runtime")
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speed("sess.run([label_name], {input_name: X_test.astype(numpy.float32)})[0]")
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###############################
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# Let's benchmark a scenario similar to what a webservice
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# experiences: the model has to do one prediction at a time
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# as opposed to a batch of prediction.
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def loop(X_test, fct, n=None):
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nrow = X_test.shape[0]
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if n is None:
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n = nrow
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for i in range(0, n):
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im = i % nrow
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fct(X_test[im: im+1])
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print("Execution time for clr.predict")
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speed("loop(X_test, clr.predict, 100)")
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def sess_predict(x):
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return sess.run([label_name], {input_name: x.astype(numpy.float32)})[0]
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print("Execution time for sess_predict")
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speed("loop(X_test, sess_predict, 100)")
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#####################################
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# Let's do the same for the probabilities.
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print("Execution time for predict_proba")
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speed("loop(X_test, clr.predict_proba, 100)")
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def sess_predict_proba(x):
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return sess.run([prob_name], {input_name: x.astype(numpy.float32)})[0]
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print("Execution time for sess_predict_proba")
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speed("loop(X_test, sess_predict_proba, 100)")
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#####################################
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# This second comparison is better as
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# ONNX Runtime, in this experience,
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# computes the label and the probabilities
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# in every case.
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##########################################
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# Benchmark with RandomForest
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# +++++++++++++++++++++++++++
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#
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# We first train and save a model in ONNX format.
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from sklearn.ensemble import RandomForestClassifier
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rf = RandomForestClassifier()
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rf.fit(X_train, y_train)
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initial_type = [('float_input', FloatTensorType([1, 4]))]
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onx = convert_sklearn(rf, initial_types=initial_type)
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with open("rf_iris.onnx", "wb") as f:
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f.write(onx.SerializeToString())
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###################################
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# We compare.
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sess = rt.InferenceSession("rf_iris.onnx")
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def sess_predict_proba_rf(x):
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return sess.run([prob_name], {input_name: x.astype(numpy.float32)})[0]
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print("Execution time for predict_proba")
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speed("loop(X_test, rf.predict_proba, 100)")
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print("Execution time for sess_predict_proba")
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speed("loop(X_test, sess_predict_proba_rf, 100)")
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##################################
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# Let's see with different number of trees.
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measures = []
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for n_trees in range(5, 51, 5):
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print(n_trees)
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rf = RandomForestClassifier(n_estimators=n_trees)
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rf.fit(X_train, y_train)
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initial_type = [('float_input', FloatTensorType([1, 4]))]
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onx = convert_sklearn(rf, initial_types=initial_type)
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with open("rf_iris_%d.onnx" % n_trees, "wb") as f:
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f.write(onx.SerializeToString())
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sess = rt.InferenceSession("rf_iris_%d.onnx" % n_trees)
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def sess_predict_proba_loop(x):
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return sess.run([prob_name], {input_name: x.astype(numpy.float32)})[0]
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tsk = speed("loop(X_test, rf.predict_proba, 100)", number=5, repeat=5)
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trt = speed("loop(X_test, sess_predict_proba_loop, 100)", number=5, repeat=5)
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measures.append({'n_trees': n_trees, 'sklearn': tsk, 'rt': trt})
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from pandas import DataFrame
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df = DataFrame(measures)
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ax = df.plot(x="n_trees", y="sklearn", label="scikit-learn", c="blue", logy=True)
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df.plot(x="n_trees", y="rt", label="onnxruntime",
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ax=ax, c="green", logy=True)
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ax.set_xlabel("Number of trees")
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ax.set_ylabel("Prediction time (s)")
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ax.set_title("Speed comparison between scikit-learn and ONNX Runtime\nFor a random forest on Iris dataset")
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ax.legend()
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