Investigate a failure from a benchmark

The method validate may raise an exception and in that case, the class BenchPerfTest. The following script shows how to investigate.

from onnxruntime import InferenceSession
from pickle import load
from time import time
import numpy
from numpy.testing import assert_almost_equal
import matplotlib.pyplot as plt
import pandas
from scipy.special import expit
import sklearn
from sklearn.utils._testing import ignore_warnings
from sklearn.linear_model import LogisticRegression
from pymlbenchmark.benchmark import BenchPerf
from pymlbenchmark.external import OnnxRuntimeBenchPerfTestBinaryClassification

Defines the benchmark and runs it

class OnnxRuntimeBenchPerfTestBinaryClassification3(
    Overwrites the class to add a pure python implementation
    of the logistic regression.

    def fcts(self, dim=None, **kwargs):

        def predict_py_predict(X, model=self.skl):
            coef = model.coef_
            intercept = model.intercept_
            pred =, coef.T) + intercept
            return (pred >= 0).astype(numpy.int32)

        def predict_py_predict_proba(X, model=self.skl):
            coef = model.coef_
            intercept = model.intercept_
            pred =, coef.T) + intercept
            decision_2d = numpy.c_[-pred, pred]
            return expit(decision_2d)

        res = OnnxRuntimeBenchPerfTestBinaryClassification.fcts(
            self, dim=dim, **kwargs)
            {'method': 'predict', 'lib': 'py', 'fct': predict_py_predict},
            {'method': 'predict_proba', 'lib': 'py',
                'fct': predict_py_predict_proba},
        return res

    def validate(self, results, **kwargs):
        Raises an exception and locally dump everything we need
        to investigate.
        # Checks that methods *predict* and *predict_proba* returns
        # the same results for both scikit-learn and onnxruntime.
            self, results, **kwargs)

        # Let's dump anything we need for later.
        # kwargs contains the input data.
        self.dump_error("Just for fun", skl=self.skl,
                        results=results, **kwargs)
        raise AssertionError("Just for fun")

def run_bench(repeat=10, verbose=False):

    pbefore = dict(dim=[1, 5], fit_intercept=[True])
    pafter = dict(N=[1, 10, 100])
    test = lambda dim=None, **opts: (
            LogisticRegression, dim=dim, **opts))
    bp = BenchPerf(pbefore, pafter, test)

    with sklearn.config_context(assume_finite=True):
        start = time()
        results = list(bp.enumerate_run_benchs(repeat=repeat, verbose=verbose))
        end = time()

    results_df = pandas.DataFrame(results)
    print("Total time = %0.3f sec\n" % (end - start))
    return results_df

Runs the benchmark.

except AssertionError as e:
0%|          | 0/6 [00:00<?, ?it/s]Just for fun

0%|          | 0/6 [00:00<?, ?it/s]


Let’s retrieve what was dumped.

filename = "BENCH-ERROR-OnnxRuntimeBenchPerfTestBinaryClassification3-0.pkl"
    with open(filename, "rb") as f:
        data = load(f)
    good = True
except Exception as e:
    good = False

if good:
    print("msg:", data["msg"])
['data', 'msg']
msg: Just for fun
['data', 'ort_onnx', 'results', 'skl']

The input data is the following:

if good:
[(array([[0.9227246]], dtype=float32),), (array([[0.24470437]], dtype=float32),), (array([[0.06703746]], dtype=float32),), (array([[0.5766344]], dtype=float32),), (array([[0.05080292]], dtype=float32),), (array([[0.58940494]], dtype=float32),), (array([[0.12481031]], dtype=float32),), (array([[0.64584213]], dtype=float32),), (array([[0.8489461]], dtype=float32),), (array([[0.36356032]], dtype=float32),)]

Let’s compare predictions.

if good:
    model_skl = data["data"]['skl']
    model_onnx = InferenceSession(data["data"]['ort_onnx'].SerializeToString())
    input_name = model_onnx.get_inputs()[0].name

def ort_predict_proba(sess, input, input_name):
    res =, {input_name: input.astype(numpy.float32)})[1]
    return pandas.DataFrame(res).values

if good:
    pred_skl = [model_skl.predict_proba(input[0])
                for input in data['data']['data']]
    pred_onnx = [ort_predict_proba(model_onnx, input[0], input_name)
                 for input in data['data']['data']]

[array([[0.5029568, 0.4970432]]), array([[0.49613747, 0.50386253]]), array([[0.49435068, 0.50564932]]), array([[0.4994759, 0.5005241]]), array([[0.49418742, 0.50581258]]), array([[0.49960434, 0.50039566]]), array([[0.49493169, 0.50506831]]), array([[0.50017198, 0.49982802]]), array([[0.50221476, 0.49778524]]), array([[0.49733285, 0.50266715]])]
[array([[0.50295681, 0.49704319]]), array([[0.49613747, 0.50386256]]), array([[0.49435067, 0.50564933]]), array([[0.4994759, 0.5005241]]), array([[0.49418741, 0.50581259]]), array([[0.49960434, 0.50039566]]), array([[0.4949317, 0.5050683]]), array([[0.50017196, 0.49982801]]), array([[0.50221479, 0.49778524]]), array([[0.49733284, 0.50266713]])]

They look the same. Let’s check…

if good:
    for a, b in zip(pred_skl, pred_onnx):
        assert_almost_equal(a, b)

Computing differences.

if good:
    def diff(a, b):
        return numpy.max(numpy.abs(a.ravel() - b.ravel()))

    diffs = list(sorted(diff(a, b) for a, b in zip(pred_skl, pred_onnx)))

        "Differences between prediction with\nscikit-learn and onnxruntime"
        "\nfor Logistic Regression")
Differences between prediction with scikit-learn and onnxruntime for Logistic Regression

Total running time of the script: ( 0 minutes 0.604 seconds)

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