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OpenVINO™ Model conversion
==========================
This notebook shows how to convert a model from original framework
format to OpenVINO Intermediate Representation (IR).
Table of contents:
^^^^^^^^^^^^^^^^^^
- `OpenVINO IR format <#openvino-ir-format>`__
- `Fetching example models <#fetching-example-models>`__
- `Conversion <#conversion>`__
- `Setting Input Shapes <#setting-input-shapes>`__
- `Compressing a Model to FP16 <#compressing-a-model-to-fp16>`__
- `Convert Models from memory <#convert-models-from-memory>`__
- `Migration from Legacy conversion
API <#migration-from-legacy-conversion-api>`__
- `Specifying Layout <#specifying-layout>`__
- `Changing Model Layout <#changing-model-layout>`__
- `Specifying Mean and Scale
Values <#specifying-mean-and-scale-values>`__
- `Reversing Input Channels <#reversing-input-channels>`__
- `Cutting Off Parts of a Model <#cutting-off-parts-of-a-model>`__
.. code:: ipython3
# Required imports. Please execute this cell first.
%pip install --upgrade pip
%pip install -q --extra-index-url https://download.pytorch.org/whl/cpu \
"openvino-dev>=2024.0.0" "requests" "tqdm" "transformers[onnx]>=4.31" "torch>=2.1" "torchvision" "tensorflow_hub" "tensorflow"
.. parsed-literal::
Requirement already satisfied: pip in /opt/home/k8sworker/ci-ai/cibuilds/ov-notebook/OVNotebookOps-681/.workspace/scm/ov-notebook/.venv/lib/python3.8/site-packages (24.0)
Note: you may need to restart the kernel to use updated packages.
Note: you may need to restart the kernel to use updated packages.
OpenVINO IR format
------------------
OpenVINO `Intermediate Representation
(IR) <https://docs.openvino.ai/2024/documentation/openvino-ir-format.html>`__
is the proprietary model format of OpenVINO. It is produced after
converting a model with model conversion API. Model conversion API
translates the frequently used deep learning operations to their
respective similar representation in OpenVINO and tunes them with the
associated weights and biases from the trained model. The resulting IR
contains two files: an ``.xml`` file, containing information about
network topology, and a ``.bin`` file, containing the weights and biases
binary data.
There are two ways to convert a model from the original framework format
to OpenVINO IR: Python conversion API and OVC command-line tool. You can
choose one of them based on whichever is most convenient for you.
OpenVINO conversion API supports next model formats: ``PyTorch``,
``TensorFlow``, ``TensorFlow Lite``, ``ONNX``, and ``PaddlePaddle``.
These model formats can be read, compiled, and converted to OpenVINO IR,
either automatically or explicitly.
For more details, refer to `Model
Preparation <https://docs.openvino.ai/2024/openvino-workflow/model-preparation.html>`__
documentation.
.. code:: ipython3
# OVC CLI tool parameters description
! ovc --help
.. parsed-literal::
usage: ovc INPUT_MODEL... [-h] [--output_model OUTPUT_MODEL]
[--compress_to_fp16 [True | False]] [--version] [--input INPUT]
[--output OUTPUT] [--extension EXTENSION] [--verbose]
positional arguments:
INPUT_MODEL Input model file(s) from TensorFlow, ONNX,
PaddlePaddle. Use openvino.convert_model in Python to
convert models from PyTorch.
optional arguments:
-h, --help show this help message and exit
--output_model OUTPUT_MODEL
This parameter is used to name output .xml/.bin files
of converted model. Model name or output directory can
be passed. If output directory is passed, the
resulting .xml/.bin files are named by original model
name.
--compress_to_fp16 [True | False]
Compress weights in output OpenVINO model to FP16. To
turn off compression use "--compress_to_fp16=False"
command line parameter. Default value is True.
--version Print ovc version and exit.
--input INPUT Information of model input required for model
conversion. This is a comma separated list with
optional input names and shapes. The order of inputs
in converted model will match the order of specified
inputs. The shape is specified as comma-separated
list. Example, to set `input_1` input with shape
[1,100] and `sequence_len` input with shape [1,?]:
"input_1[1,100],sequence_len[1,?]", where "?" is a
dynamic dimension, which means that such a dimension
can be specified later in the runtime. If the
dimension is set as an integer (like 100 in [1,100]),
such a dimension is not supposed to be changed later,
during a model conversion it is treated as a static
value. Example with unnamed inputs: "[1,100],[1,?]".
--output OUTPUT One or more comma-separated model outputs to be
preserved in the converted model. Other outputs are
removed. If `output` parameter is not specified then
all outputs from the original model are preserved. Do
not add :0 to the names for TensorFlow. The order of
outputs in the converted model is the same as the
order of specified names. Example: ovc model.onnx
output=out_1,out_2
--extension EXTENSION
Paths or a comma-separated list of paths to libraries
(.so or .dll) with extensions.
--verbose Print detailed information about conversion.
Fetching example models
-----------------------
This notebook uses two models for conversion examples:
- `Distilbert <https://huggingface.co/distilbert-base-uncased-finetuned-sst-2-english>`__
NLP model from Hugging Face
- `Resnet50 <https://pytorch.org/vision/stable/models/generated/torchvision.models.resnet50.html#torchvision.models.ResNet50_Weights>`__
CV classification model from torchvision
.. code:: ipython3
from pathlib import Path
# create a directory for models files
MODEL_DIRECTORY_PATH = Path("model")
MODEL_DIRECTORY_PATH.mkdir(exist_ok=True)
Fetch
`distilbert <https://huggingface.co/distilbert-base-uncased-finetuned-sst-2-english>`__
NLP model from Hugging Face and export it in ONNX format:
.. code:: ipython3
from transformers import AutoModelForSequenceClassification, AutoTokenizer
from transformers.onnx import export, FeaturesManager
ONNX_NLP_MODEL_PATH = MODEL_DIRECTORY_PATH / "distilbert.onnx"
# download model
hf_model = AutoModelForSequenceClassification.from_pretrained("distilbert-base-uncased-finetuned-sst-2-english")
# initialize tokenizer
tokenizer = AutoTokenizer.from_pretrained("distilbert-base-uncased-finetuned-sst-2-english")
# get model onnx config function for output feature format sequence-classification
model_kind, model_onnx_config = FeaturesManager.check_supported_model_or_raise(hf_model, feature="sequence-classification")
# fill onnx config based on pytorch model config
onnx_config = model_onnx_config(hf_model.config)
# export to onnx format
export(
preprocessor=tokenizer,
model=hf_model,
config=onnx_config,
opset=onnx_config.default_onnx_opset,
output=ONNX_NLP_MODEL_PATH,
)
.. parsed-literal::
2024-05-15 23:49:16.064636: I tensorflow/core/util/port.cc:110] oneDNN custom operations are on. You may see slightly different numerical results due to floating-point round-off errors from different computation orders. To turn them off, set the environment variable `TF_ENABLE_ONEDNN_OPTS=0`.
2024-05-15 23:49:16.099980: I tensorflow/core/platform/cpu_feature_guard.cc:182] This TensorFlow binary is optimized to use available CPU instructions in performance-critical operations.
To enable the following instructions: AVX2 AVX512F AVX512_VNNI FMA, in other operations, rebuild TensorFlow with the appropriate compiler flags.
2024-05-15 23:49:16.617080: W tensorflow/compiler/tf2tensorrt/utils/py_utils.cc:38] TF-TRT Warning: Could not find TensorRT
/opt/home/k8sworker/ci-ai/cibuilds/ov-notebook/OVNotebookOps-681/.workspace/scm/ov-notebook/.venv/lib/python3.8/site-packages/huggingface_hub/file_download.py:1132: FutureWarning: `resume_download` is deprecated and will be removed in version 1.0.0. Downloads always resume when possible. If you want to force a new download, use `force_download=True`.
warnings.warn(
/opt/home/k8sworker/ci-ai/cibuilds/ov-notebook/OVNotebookOps-681/.workspace/scm/ov-notebook/.venv/lib/python3.8/site-packages/transformers/models/distilbert/modeling_distilbert.py:234: TracerWarning: torch.tensor results are registered as constants in the trace. You can safely ignore this warning if you use this function to create tensors out of constant variables that would be the same every time you call this function. In any other case, this might cause the trace to be incorrect.
mask, torch.tensor(torch.finfo(scores.dtype).min)
.. parsed-literal::
(['input_ids', 'attention_mask'], ['logits'])
Fetch
`Resnet50 <https://pytorch.org/vision/stable/models/generated/torchvision.models.resnet50.html#torchvision.models.ResNet50_Weights>`__
CV classification model from torchvision:
.. code:: ipython3
from torchvision.models import resnet50, ResNet50_Weights
# create model object
pytorch_model = resnet50(weights=ResNet50_Weights.DEFAULT)
# switch model from training to inference mode
pytorch_model.eval()
.. parsed-literal::
ResNet(
(conv1): Conv2d(3, 64, kernel_size=(7, 7), stride=(2, 2), padding=(3, 3), bias=False)
(bn1): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
(maxpool): MaxPool2d(kernel_size=3, stride=2, padding=1, dilation=1, ceil_mode=False)
(layer1): Sequential(
(0): Bottleneck(
(conv1): Conv2d(64, 64, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(64, 64, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(64, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
(downsample): Sequential(
(0): Conv2d(64, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
)
)
(1): Bottleneck(
(conv1): Conv2d(256, 64, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(64, 64, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(64, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
(2): Bottleneck(
(conv1): Conv2d(256, 64, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(64, 64, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(64, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
)
(layer2): Sequential(
(0): Bottleneck(
(conv1): Conv2d(256, 128, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(128, 128, kernel_size=(3, 3), stride=(2, 2), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(128, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
(downsample): Sequential(
(0): Conv2d(256, 512, kernel_size=(1, 1), stride=(2, 2), bias=False)
(1): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
)
)
(1): Bottleneck(
(conv1): Conv2d(512, 128, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(128, 128, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(128, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
(2): Bottleneck(
(conv1): Conv2d(512, 128, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(128, 128, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(128, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
(3): Bottleneck(
(conv1): Conv2d(512, 128, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(128, 128, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(128, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
)
(layer3): Sequential(
(0): Bottleneck(
(conv1): Conv2d(512, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(2, 2), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
(downsample): Sequential(
(0): Conv2d(512, 1024, kernel_size=(1, 1), stride=(2, 2), bias=False)
(1): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
)
)
(1): Bottleneck(
(conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
(2): Bottleneck(
(conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
(3): Bottleneck(
(conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
(4): Bottleneck(
(conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
(5): Bottleneck(
(conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
)
(layer4): Sequential(
(0): Bottleneck(
(conv1): Conv2d(1024, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(512, 512, kernel_size=(3, 3), stride=(2, 2), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(512, 2048, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(2048, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
(downsample): Sequential(
(0): Conv2d(1024, 2048, kernel_size=(1, 1), stride=(2, 2), bias=False)
(1): BatchNorm2d(2048, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
)
)
(1): Bottleneck(
(conv1): Conv2d(2048, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(512, 2048, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(2048, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
(2): Bottleneck(
(conv1): Conv2d(2048, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn1): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv2): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
(bn2): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(conv3): Conv2d(512, 2048, kernel_size=(1, 1), stride=(1, 1), bias=False)
(bn3): BatchNorm2d(2048, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
(relu): ReLU(inplace=True)
)
)
(avgpool): AdaptiveAvgPool2d(output_size=(1, 1))
(fc): Linear(in_features=2048, out_features=1000, bias=True)
)
Convert PyTorch model to ONNX format:
.. code:: ipython3
import torch
import warnings
ONNX_CV_MODEL_PATH = MODEL_DIRECTORY_PATH / "resnet.onnx"
if ONNX_CV_MODEL_PATH.exists():
print(f"ONNX model {ONNX_CV_MODEL_PATH} already exists.")
else:
with warnings.catch_warnings():
warnings.filterwarnings("ignore")
torch.onnx.export(model=pytorch_model, args=torch.randn(1, 3, 224, 224), f=ONNX_CV_MODEL_PATH)
print(f"ONNX model exported to {ONNX_CV_MODEL_PATH}")
.. parsed-literal::
ONNX model exported to model/resnet.onnx
Conversion
----------
To convert a model to OpenVINO IR, use the following API:
.. code:: ipython3
import openvino as ov
# ov.convert_model returns an openvino.runtime.Model object
print(ONNX_NLP_MODEL_PATH)
ov_model = ov.convert_model(ONNX_NLP_MODEL_PATH)
# then model can be serialized to *.xml & *.bin files
ov.save_model(ov_model, MODEL_DIRECTORY_PATH / "distilbert.xml")
.. parsed-literal::
model/distilbert.onnx
.. code:: ipython3
! ovc model/distilbert.onnx --output_model model/distilbert.xml
.. parsed-literal::
huggingface/tokenizers: The current process just got forked, after parallelism has already been used. Disabling parallelism to avoid deadlocks...
To disable this warning, you can either:
- Avoid using `tokenizers` before the fork if possible
- Explicitly set the environment variable TOKENIZERS_PARALLELISM=(true | false)
.. parsed-literal::
[ INFO ] Generated IR will be compressed to FP16. If you get lower accuracy, please consider disabling compression by removing argument "compress_to_fp16" or set it to false "compress_to_fp16=False".
Find more information about compression to FP16 at https://docs.openvino.ai/2023.0/openvino_docs_MO_DG_FP16_Compression.html
[ SUCCESS ] XML file: model/distilbert.xml
[ SUCCESS ] BIN file: model/distilbert.bin
Setting Input Shapes
^^^^^^^^^^^^^^^^^^^^
Model conversion is supported for models with dynamic input shapes that
contain undefined dimensions. However, if the shape of data is not going
to change from one inference request to another, it is recommended to
set up static shapes (when all dimensions are fully defined) for the
inputs. Doing so at the model preparation stage, not at runtime, can be
beneficial in terms of performance and memory consumption.
For more information refer to `Setting Input
Shapes <https://docs.openvino.ai/2024/openvino-workflow/model-preparation/setting-input-shapes.html>`__
documentation.
.. code:: ipython3
import openvino as ov
ov_model = ov.convert_model(ONNX_NLP_MODEL_PATH, input=[("input_ids", [1, 128]), ("attention_mask", [1, 128])])
.. code:: ipython3
! ovc model/distilbert.onnx --input input_ids[1,128],attention_mask[1,128] --output_model model/distilbert.xml
.. parsed-literal::
huggingface/tokenizers: The current process just got forked, after parallelism has already been used. Disabling parallelism to avoid deadlocks...
To disable this warning, you can either:
- Avoid using `tokenizers` before the fork if possible
- Explicitly set the environment variable TOKENIZERS_PARALLELISM=(true | false)
.. parsed-literal::
[ INFO ] Generated IR will be compressed to FP16. If you get lower accuracy, please consider disabling compression by removing argument "compress_to_fp16" or set it to false "compress_to_fp16=False".
Find more information about compression to FP16 at https://docs.openvino.ai/2023.0/openvino_docs_MO_DG_FP16_Compression.html
[ SUCCESS ] XML file: model/distilbert.xml
[ SUCCESS ] BIN file: model/distilbert.bin
The ``input`` parameter allows overriding original input shapes if it is
supported by the model topology. Shapes with dynamic dimensions in the
original model can be replaced with static shapes for the converted
model, and vice versa. The dynamic dimension can be marked in model
conversion API parameter as ``-1`` or ``?`` when using ``ovc``:
.. code:: ipython3
import openvino as ov
ov_model = ov.convert_model(ONNX_NLP_MODEL_PATH, input=[("input_ids", [1, -1]), ("attention_mask", [1, -1])])
.. code:: ipython3
! ovc model/distilbert.onnx --input "input_ids[1,?],attention_mask[1,?]" --output_model model/distilbert.xml
.. parsed-literal::
huggingface/tokenizers: The current process just got forked, after parallelism has already been used. Disabling parallelism to avoid deadlocks...
To disable this warning, you can either:
- Avoid using `tokenizers` before the fork if possible
- Explicitly set the environment variable TOKENIZERS_PARALLELISM=(true | false)
.. parsed-literal::
[ INFO ] Generated IR will be compressed to FP16. If you get lower accuracy, please consider disabling compression by removing argument "compress_to_fp16" or set it to false "compress_to_fp16=False".
Find more information about compression to FP16 at https://docs.openvino.ai/2023.0/openvino_docs_MO_DG_FP16_Compression.html
[ SUCCESS ] XML file: model/distilbert.xml
[ SUCCESS ] BIN file: model/distilbert.bin
To optimize memory consumption for models with undefined dimensions in
runtime, model conversion API provides the capability to define
boundaries of dimensions. The boundaries of undefined dimension can be
specified with ellipsis in the command line or with
``openvino.Dimension`` class in Python. For example, launch model
conversion for the ONNX Bert model and specify a boundary for the
sequence length dimension:
.. code:: ipython3
import openvino as ov
sequence_length_dim = ov.Dimension(10, 128)
ov_model = ov.convert_model(
ONNX_NLP_MODEL_PATH,
input=[
("input_ids", [1, sequence_length_dim]),
("attention_mask", [1, sequence_length_dim]),
],
)
.. code:: ipython3
! ovc model/distilbert.onnx --input input_ids[1,10..128],attention_mask[1,10..128] --output_model model/distilbert.xml
.. parsed-literal::
huggingface/tokenizers: The current process just got forked, after parallelism has already been used. Disabling parallelism to avoid deadlocks...
To disable this warning, you can either:
- Avoid using `tokenizers` before the fork if possible
- Explicitly set the environment variable TOKENIZERS_PARALLELISM=(true | false)
.. parsed-literal::
[ INFO ] Generated IR will be compressed to FP16. If you get lower accuracy, please consider disabling compression by removing argument "compress_to_fp16" or set it to false "compress_to_fp16=False".
Find more information about compression to FP16 at https://docs.openvino.ai/2023.0/openvino_docs_MO_DG_FP16_Compression.html
[ SUCCESS ] XML file: model/distilbert.xml
[ SUCCESS ] BIN file: model/distilbert.bin
Compressing a Model to FP16
^^^^^^^^^^^^^^^^^^^^^^^^^^^
By default model weights compressed to FP16 format when saving OpenVINO
model to IR. This saves up to 2x storage space for the model file and in
most cases doesn’t sacrifice model accuracy. Weight compression can be
disabled by setting ``compress_to_fp16`` flag to ``False``:
.. code:: ipython3
import openvino as ov
ov_model = ov.convert_model(ONNX_NLP_MODEL_PATH)
ov.save_model(ov_model, MODEL_DIRECTORY_PATH / "distilbert.xml", compress_to_fp16=False)
.. code:: ipython3
! ovc model/distilbert.onnx --output_model model/distilbert.xml --compress_to_fp16=False
.. parsed-literal::
huggingface/tokenizers: The current process just got forked, after parallelism has already been used. Disabling parallelism to avoid deadlocks...
To disable this warning, you can either:
- Avoid using `tokenizers` before the fork if possible
- Explicitly set the environment variable TOKENIZERS_PARALLELISM=(true | false)
.. parsed-literal::
[ SUCCESS ] XML file: model/distilbert.xml
[ SUCCESS ] BIN file: model/distilbert.bin
Convert Models from memory
^^^^^^^^^^^^^^^^^^^^^^^^^^
Model conversion API supports passing original framework Python object
directly. More details can be found in
`PyTorch <https://docs.openvino.ai/2024/openvino-workflow/model-preparation/convert-model-pytorch.html>`__,
`TensorFlow <https://docs.openvino.ai/2024/openvino-workflow/model-preparation/convert-model-tensorflow.html>`__,
`PaddlePaddle <https://docs.openvino.ai/2024/openvino-workflow/model-preparation/convert-model-paddle.html>`__
frameworks conversion guides.
.. code:: ipython3
import openvino as ov
import torch
example_input = torch.rand(1, 3, 224, 224)
ov_model = ov.convert_model(pytorch_model, example_input=example_input, input=example_input.shape)
.. parsed-literal::
WARNING:tensorflow:Please fix your imports. Module tensorflow.python.training.tracking.base has been moved to tensorflow.python.trackable.base. The old module will be deleted in version 2.11.
.. code:: ipython3
import os
import openvino as ov
import tensorflow_hub as hub
os.environ["TFHUB_CACHE_DIR"] = str(Path("./tfhub_modules").resolve())
model = hub.load("https://www.kaggle.com/models/google/movenet/frameworks/TensorFlow2/variations/singlepose-lightning/versions/4")
movenet = model.signatures["serving_default"]
ov_model = ov.convert_model(movenet)
.. parsed-literal::
2024-05-15 23:49:36.583572: E tensorflow/compiler/xla/stream_executor/cuda/cuda_driver.cc:266] failed call to cuInit: CUDA_ERROR_COMPAT_NOT_SUPPORTED_ON_DEVICE: forward compatibility was attempted on non supported HW
2024-05-15 23:49:36.583606: I tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:168] retrieving CUDA diagnostic information for host: iotg-dev-workstation-07
2024-05-15 23:49:36.583610: I tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:175] hostname: iotg-dev-workstation-07
2024-05-15 23:49:36.583842: I tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:199] libcuda reported version is: 470.223.2
2024-05-15 23:49:36.583866: I tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:203] kernel reported version is: 470.182.3
2024-05-15 23:49:36.583871: E tensorflow/compiler/xla/stream_executor/cuda/cuda_diagnostics.cc:312] kernel version 470.182.3 does not match DSO version 470.223.2 -- cannot find working devices in this configuration
Migration from Legacy conversion API
------------------------------------
In the 2023.1 OpenVINO release OpenVINO Model Conversion API was
introduced with the corresponding Python API: ``openvino.convert_model``
method. ``ovc`` and ``openvino.convert_model`` represent a lightweight
alternative of ``mo`` and ``openvino.tools.mo.convert_model`` which are
considered legacy API now. ``mo.convert_model()`` provides a wide range
of preprocessing parameters. Most of these parameters have analogs in
OVC or can be replaced with functionality from ``ov.PrePostProcessor``
class. Refer to `Optimize Preprocessing
notebook <optimize-preprocessing-with-output.html>`__ for
more information about `Preprocessing
API <https://docs.openvino.ai/2024/openvino-workflow/running-inference/optimize-inference/optimize-preprocessing.html>`__.
Here is the migration guide from legacy model preprocessing to
Preprocessing API.
Specifying Layout
^^^^^^^^^^^^^^^^^
Layout defines the meaning of dimensions in a shape and can be specified
for both inputs and outputs. Some preprocessing requires to set input
layouts, for example, setting a batch, applying mean or scales, and
reversing input channels (BGR<->RGB). For the layout syntax, check the
`Layout API
overview <https://docs.openvino.ai/2024/openvino-workflow/running-inference/optimize-inference/optimize-preprocessing/layout-api-overview.html>`__.
To specify the layout, you can use the layout option followed by the
layout value.
The following example specifies the ``NCHW`` layout for a Pytorch
Resnet50 model that was exported to the ONNX format:
.. code:: ipython3
# Converter API
import openvino as ov
ov_model = ov.convert_model(ONNX_CV_MODEL_PATH)
prep = ov.preprocess.PrePostProcessor(ov_model)
prep.input("input.1").model().set_layout(ov.Layout("nchw"))
ov_model = prep.build()
.. code:: ipython3
# Legacy Model Optimizer API
from openvino.tools import mo
ov_model = mo.convert_model(ONNX_CV_MODEL_PATH, layout="nchw")
.. parsed-literal::
huggingface/tokenizers: The current process just got forked, after parallelism has already been used. Disabling parallelism to avoid deadlocks...
To disable this warning, you can either:
- Avoid using `tokenizers` before the fork if possible
- Explicitly set the environment variable TOKENIZERS_PARALLELISM=(true | false)
Changing Model Layout
^^^^^^^^^^^^^^^^^^^^^
Transposing of matrices/tensors is a typical operation in Deep Learning
- you may have a BMP image ``640x480``, which is an array of
``{480, 640, 3}`` elements, but Deep Learning model can require input
with shape ``{1, 3, 480, 640}``.
Conversion can be done implicitly, using the layout of a user’s tensor
and the layout of an original model:
.. code:: ipython3
# Converter API
import openvino as ov
ov_model = ov.convert_model(ONNX_CV_MODEL_PATH)
prep = ov.preprocess.PrePostProcessor(ov_model)
prep.input("input.1").tensor().set_layout(ov.Layout("nhwc"))
prep.input("input.1").model().set_layout(ov.Layout("nchw"))
ov_model = prep.build()
.. code:: ipython3
# Legacy Model Optimizer API
from openvino.tools import mo
ov_model = mo.convert_model(ONNX_CV_MODEL_PATH, layout="nchw->nhwc")
# alternatively use source_layout and target_layout parameters
ov_model = mo.convert_model(ONNX_CV_MODEL_PATH, source_layout="nchw", target_layout="nhwc")
Specifying Mean and Scale Values
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Using Preprocessing API ``mean`` and ``scale`` values can be set. Using
these API, model embeds the corresponding preprocessing block for
mean-value normalization of the input data and optimizes this block.
Refer to `Optimize Preprocessing
notebook <optimize-preprocessing-with-output.html>`__ for
more examples.
.. code:: ipython3
# Converter API
import openvino as ov
ov_model = ov.convert_model(ONNX_CV_MODEL_PATH)
prep = ov.preprocess.PrePostProcessor(ov_model)
prep.input("input.1").tensor().set_layout(ov.Layout("nchw"))
prep.input("input.1").preprocess().mean([255 * x for x in [0.485, 0.456, 0.406]])
prep.input("input.1").preprocess().scale([255 * x for x in [0.229, 0.224, 0.225]])
ov_model = prep.build()
.. code:: ipython3
# Legacy Model Optimizer API
from openvino.tools import mo
ov_model = mo.convert_model(
ONNX_CV_MODEL_PATH,
mean_values=[255 * x for x in [0.485, 0.456, 0.406]],
scale_values=[255 * x for x in [0.229, 0.224, 0.225]],
)
Reversing Input Channels
^^^^^^^^^^^^^^^^^^^^^^^^
Sometimes, input images for your application can be of the ``RGB`` (or
``BGR``) format, and the model is trained on images of the ``BGR`` (or
``RGB``) format, which is in the opposite order of color channels. In
this case, it is important to preprocess the input images by reverting
the color channels before inference.
.. code:: ipython3
# Converter API
import openvino as ov
ov_model = ov.convert_model(ONNX_CV_MODEL_PATH)
prep = ov.preprocess.PrePostProcessor(ov_model)
prep.input("input.1").tensor().set_layout(ov.Layout("nchw"))
prep.input("input.1").preprocess().reverse_channels()
ov_model = prep.build()
.. code:: ipython3
# Legacy Model Optimizer API
from openvino.tools import mo
ov_model = mo.convert_model(ONNX_CV_MODEL_PATH, reverse_input_channels=True)
Cutting Off Parts of a Model
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Cutting model inputs and outputs from a model is no longer available in
the new conversion API. Instead, we recommend performing the cut in the
original framework. Examples of model cutting of TensorFlow protobuf,
TensorFlow SavedModel, and ONNX formats with tools provided by the
Tensorflow and ONNX frameworks can be found in `documentation
guide <https://docs.openvino.ai/2024/documentation/legacy-features/transition-legacy-conversion-api.html#cutting-off-parts-of-a-model>`__.
For PyTorch, TensorFlow 2 Keras, and PaddlePaddle, we recommend changing
the original model code to perform the model cut.
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