219 строки
5.2 KiB
Plaintext
219 строки
5.2 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Convert And Inference PyTorch model with CustomOps\n",
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"\n",
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"This notebook demonstrates how to use onnxruntime-extensions to run a PyTorch model that contains operators that are not part of the ONNX standard."
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Model definition and export to ONNX\n",
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"Suppose there is a model that cannot be converted because there is no matrix inverse operation in ONNX standard opset. And the model will be defined like the following."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"import torch\n",
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"\n",
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"class CustomInverse(torch.nn.Module):\n",
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" def forward(self, x):\n",
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" return torch.inverse(x) + x"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"To export this model into ONNX format, we need register a custom op handler for pytorch.onnx.exporter."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {},
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"outputs": [],
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"source": [
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"from torch.onnx import register_custom_op_symbolic\n",
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"\n",
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"\n",
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"def my_inverse(g, self):\n",
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" return g.op(\"ai.onnx.contrib::Inverse\", self)\n",
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"\n",
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"register_custom_op_symbolic('::inverse', my_inverse, 1)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"Then, invoke the exporter"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {
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"scrolled": false
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},
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"outputs": [],
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"source": [
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"import io\n",
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"import onnx\n",
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"\n",
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"x0 = torch.randn(3, 3)\n",
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"# Export model to ONNX\n",
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"f = io.BytesIO()\n",
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"t_model = CustomInverse()\n",
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"torch.onnx.export(t_model, (x0, ), f, opset_version=12)\n",
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"onnx_model = onnx.load(io.BytesIO(f.getvalue()))"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"Now, we got a ONNX model in the memory, and it can be save into a disk file by 'onnx.save_model(onnx_model, <file_path>)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Inference\n",
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"This converted model cannot directly run the onnxruntime due to the custom operator. but it can run with onnxruntime_extensions easily.\n",
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"\n",
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"Firstly, let define a PyOp function to intepret the custom op node in the ONNX model."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {},
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"outputs": [],
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"source": [
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"import numpy\n",
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"from onnxruntime_extensions import onnx_op, PyOp\n",
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"@onnx_op(op_type=\"Inverse\")\n",
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"def inverse(x):\n",
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" # the user custom op implementation here:\n",
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" return numpy.linalg.inv(x)\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"* **ONNX Inference**"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[[-3.081008 0.20269153 0.42009977]\n",
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" [-3.3962293 2.5986686 2.4447646 ]\n",
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" [ 0.7805753 -0.20394287 -2.7528977 ]]\n"
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]
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}
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],
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"source": [
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"from onnxruntime_extensions import PyOrtFunction\n",
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"onnx_fn = PyOrtFunction.from_model(onnx_model)\n",
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"y = onnx_fn(x0.numpy())\n",
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"print(y)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"* **Compare the result with PyTorch**"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"metadata": {},
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"outputs": [],
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"source": [
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"t_y = t_model(x0)\n",
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"numpy.testing.assert_almost_equal(t_y, y, decimal=5)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Implement the customop in C++ (optional)\n",
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"To make the ONNX model with the CustomOp run on all other languages supported by the ONNX Runtime and be independent of Python, a C++ implementation is needed, check [inverse.hpp](../operators/math/dlib/inverse.hpp) for an example on how to do that."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[[-3.081008 0.20269153 0.42009977]\n",
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" [-3.3962293 2.5986686 2.4447646 ]\n",
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" [ 0.7805753 -0.20394287 -2.7528977 ]]\n"
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]
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}
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],
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"source": [
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"from onnxruntime_extensions import enable_py_op\n",
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"# disable the PyOp function and run with the C++ function\n",
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"enable_py_op(False)\n",
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"y = onnx_fn(x0.numpy())\n",
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"print(y)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.8.5"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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