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255 lines
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8.1 KiB
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---
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title: Python
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parent: Get Started
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toc: true
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nav_order: 1
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---
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# Get started with ORT for Python
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{: .no_toc }
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Below is a quick guide to get the packages installed to use ONNX for model serialization and infernece with ORT.
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## Contents
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{: .no_toc }
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* TOC placeholder
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{:toc}
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## Install ONNX Runtime (ORT)
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```python
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pip install onnxruntime
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```
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## Install ONNX for model export
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```python
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## ONNX is built into PyTorch
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pip install torch
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```
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```python
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## tensorflow
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pip install tf2onnx
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```
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```python
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## sklearn
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pip install skl2onnx
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```
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## Quickstart Examples for PyTorch, TensorFlow, and SciKit Learn
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Train a model using your favorite framework, export to ONNX format and inference in any supported ONNX Runtime language!
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### PyTorch CV
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{: .no_toc }
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In this example we will go over how to export a PyTorch CV model into ONNX format and then inference with ORT. The code to create the model is from the [PyTorch Fundamentals learning path on Microsoft Learn](https://aka.ms/learnpytorch).
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- Export the model using `torch.onnx.export`
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```python
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torch.onnx.export(model, # model being run
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torch.randn(1, 28, 28).to(device), # model input (or a tuple for multiple inputs)
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"fashion_mnist_model.onnx", # where to save the model (can be a file or file-like object)
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input_names = ['input'], # the model's input names
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output_names = ['output']) # the model's output names
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```
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- Load the onnx model with `onnx.load`
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```python
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import onnx
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onnx_model = onnx.load("fashion_mnist_model.onnx")
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onnx.checker.check_model(onnx_model)
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```
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- Create inference session using `ort.InferenceSession`
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```python
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import onnxruntime as ort
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import numpy as np
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x, y = test_data[0][0], test_data[0][1]
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ort_sess = ort.InferenceSession('fashion_mnist_model.onnx')
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outputs = ort_sess.run(None, {'input': x.numpy()})
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# Print Result
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predicted, actual = classes[outputs[0][0].argmax(0)], classes[y]
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print(f'Predicted: "{predicted}", Actual: "{actual}"')
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```
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### PyTorch NLP
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{: .no_toc }
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In this example we will go over how to export a PyTorch NLP model into ONNX format and then inference with ORT. The code to create the AG News model is from [this PyTorch tutorial](https://pytorch.org/tutorials/beginner/text_sentiment_ngrams_tutorial.html).
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- Process text and create the sample data input and offsets for export.
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```python
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import torch
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text = "Text from the news article"
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text = torch.tensor(text_pipeline(text))
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offsets = torch.tensor([0])
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```
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- Export Model
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```python
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# Export the model
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torch.onnx.export(model, # model being run
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(text, offsets), # model input (or a tuple for multiple inputs)
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"ag_news_model.onnx", # where to save the model (can be a file or file-like object)
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export_params=True, # store the trained parameter weights inside the model file
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opset_version=10, # the ONNX version to export the model to
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do_constant_folding=True, # whether to execute constant folding for optimization
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input_names = ['input', 'offsets'], # the model's input names
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output_names = ['output'], # the model's output names
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dynamic_axes={'input' : {0 : 'batch_size'}, # variable length axes
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'output' : {0 : 'batch_size'}})
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```
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- Load the model using `onnx.load`
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```python
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import onnx
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onnx_model = onnx.load("ag_news_model.onnx")
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onnx.checker.check_model(onnx_model)
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```
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- Create inference session with `ort.infernnce`
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```python
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import onnxruntime as ort
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import numpy as np
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ort_sess = ort.InferenceSession('ag_news_model.onnx')
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outputs = ort_sess.run(None, {'input': text.numpy(),
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'offsets': torch.tensor([0]).numpy()})
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# Print Result
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result = outputs[0].argmax(axis=1)+1
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print("This is a %s news" %ag_news_label[result[0]])
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```
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### TensorFlow CV
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{: .no_toc }
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In this example we will go over how to export a TensorFlow CV model into ONNX format and then inference with ORT. The model used is from this [GitHub Notebook for Keras resnet50](https://github.com/onnx/tensorflow-onnx/blob/master/tutorials/keras-resnet50.ipynb).
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- Get the pretrained model
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```python
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import os
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import tensorflow as tf
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from tensorflow.keras.applications.resnet50 import ResNet50
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import onnxruntime
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model = ResNet50(weights='imagenet')
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preds = model.predict(x)
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print('Keras Predicted:', decode_predictions(preds, top=3)[0])
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model.save(os.path.join("/tmp", model.name))
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```
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- Convert the model to onnx and export
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```python
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import tf2onnx
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import onnxruntime as rt
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spec = (tf.TensorSpec((None, 224, 224, 3), tf.float32, name="input"),)
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output_path = model.name + ".onnx"
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model_proto, _ = tf2onnx.convert.from_keras(model, input_signature=spec, opset=13, output_path=output_path)
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output_names = [n.name for n in model_proto.graph.output]
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```
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- Create inference session with `rt.infernnce`
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```python
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providers = ['CPUExecutionProvider']
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m = rt.InferenceSession(output_path, providers=providers)
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onnx_pred = m.run(output_names, {"input": x})
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print('ONNX Predicted:', decode_predictions(onnx_pred[0], top=3)[0])
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```
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### SciKit Learn CV
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{: .no_toc }
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In this example we will go over how to export a SciKit Learn CV model into ONNX format and then inference with ORT. We’ll use the famous iris datasets.
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```python
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from sklearn.datasets import load_iris
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from sklearn.model_selection import train_test_split
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iris = load_iris()
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X, y = iris.data, iris.target
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X_train, X_test, y_train, y_test = train_test_split(X, y)
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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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print(clr)
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LogisticRegression()
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```
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- Convert or export the model into ONNX format
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```python
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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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- Load and run the model using ONNX Runtime
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We will use ONNX Runtime to compute the predictions for this machine learning model.
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```python
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import numpy
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import onnxruntime as rt
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sess = rt.InferenceSession("logreg_iris.onnx")
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input_name = sess.get_inputs()[0].name
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pred_onx = sess.run(None, {input_name: X_test.astype(numpy.float32)})[0]
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print(pred_onx)
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OUTPUT:
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[0 1 0 0 1 2 2 0 0 2 1 0 2 2 1 1 2 2 2 0 2 2 1 2 1 1 1 0 2 1 1 1 1 0 1 0 0
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1]
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```
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- Get predicted class
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The code can be changed to get one specific output by specifying its name into a list.
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```python
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import numpy
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import onnxruntime as rt
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sess = rt.InferenceSession("logreg_iris.onnx")
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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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pred_onx = sess.run(
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[label_name], {input_name: X_test.astype(numpy.float32)})[0]
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print(pred_onx)
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```
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## Python API Reference Docs
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<span class="fs-5"> [Go to the ORT Python API Docs](../api/python/api_summary.html){: .btn .mr-4 target="_blank"} </span>
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## Builds
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If using pip, run pip install `--upgrade pip` prior to downloading.
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| Artifact | Description | Supported Platforms |
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|----------- |-------------|---------------------|
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|[onnxruntime](https://pypi.org/project/onnxruntime)|CPU (Release)| Windows (x64), Linux (x64, ARM64), Mac (X64), |
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|[ort-nightly](https://test.pypi.org/project/ort-nightly)|CPU (Dev) | Same as above |
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|[onnxruntime-gpu](https://pypi.org/project/onnxruntime-gpu)|GPU (Release)| Windows (x64), Linux (x64, ARM64) |
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|[ort-nightly-gpu](https://test.pypi.org/project/ort-nightly-gpu)|GPU (Dev) | Same as above |
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For Python compiler version notes, see [this page](https://github.com/microsoft/onnxruntime/tree/master/docs/Python_Dev_Notes.md)
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## Supported Versions
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Python 3.6 - 3.9
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## Learn More
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- [Python Tutorials](../tutorials/api-basics)
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* [TensorFlow with ONNX Runtime](../tutorials/tf-get-started.md)
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* [PyTorch with ONNX Runtime](https://pytorch.org/tutorials/advanced/super_resolution_with_onnxruntime.html)
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* [scikit-learn with ONNX Runtime](http://onnx.ai/sklearn-onnx/index_tutorial.html)
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