isolation-forest-onnx
A converter for the LinkedIn Spark/Scala isolation forest model format to ONNX format for broad portability across platforms and languages.
Note: ONNX conversion is supported for the standard IsolationForestModel only. The ExtendedIsolationForestModel uses hyperplane-based splits that are not compatible with the axis-aligned tree ensemble representation used by the ONNX converter.
Installation
pip install isolation-forest-onnx
It is recommended to use the same version of the converter as the version of the isolation-forest library used to train the model.
Converting a trained model to ONNX
import os
from isolationforestonnx.isolation_forest_converter import IsolationForestConverter
# Path where the trained IsolationForestModel was saved in Scala
path = '/user/testuser/isolationForestWriteTest'
# Get model data path
data_dir_path = path + '/data'
avro_model_file = os.listdir(data_dir_path)
model_file_path = data_dir_path + '/' + avro_model_file[0]
# Get model metadata file path
metadata_dir_path = path + '/metadata'
metadata_file = os.listdir(metadata_dir_path)
metadata_file_path = metadata_dir_path + '/' + metadata_file[0]
# Convert the model to ONNX format (returns the ONNX model in memory)
converter = IsolationForestConverter(model_file_path, metadata_file_path)
onnx_model = converter.convert()
# Convert and save the model in ONNX format
onnx_model_path = '/user/testuser/isolationForestWriteTest.onnx'
converter.convert_and_save(onnx_model_path)
Using the ONNX model for inference
import numpy as np
import onnx
from onnxruntime import InferenceSession
onnx_model_path = '/user/testuser/isolationForestWriteTest.onnx'
dataset_path = 'shuttle.csv'
# Load data
input_data = np.loadtxt(dataset_path, delimiter=',')
num_features = input_data.shape[1] - 1
last_col_index = num_features
# The last column is the label column
input_dict = {'features': np.delete(input_data, last_col_index, 1).astype(dtype=np.float32)}
# Load the ONNX model and run inference
onx = onnx.load(onnx_model_path)
sess = InferenceSession(onx.SerializeToString())
res = sess.run(None, input_dict)
# Print scores
outlier_scores = res[0]
print(np.transpose(outlier_scores[:10])[0])
License
BSD 2-Clause License. See LICENSE for details.
1 maintainer
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