How to perform model quantization in PyTorch?

One option could be: “For model quantization in PyTorch, you can utilize the functionalities provided by the torch.quantization module. Here is a simple example code.”


import torch
import torchvision
from torch.quantization import QuantStub, DeQuantStub, quantize, prepare, convert

# 定义一个示例模型
model = torchvision.models.resnet18()

# 创建QuantStub和DeQuantStub对象
quant_stub = QuantStub()
dequant_stub = DeQuantStub()

# 将模型和量化/反量化层包装在prepare中
model = torch.nn.Sequential(quant_stub, model, dequant_stub)

# 准备模型进行量化
model.qconfig = torch.quantization.get_default_qconfig('fbgemm')
model_prepared = prepare(model)

# 量化模型
quantized_model = quantize(model_prepared)

# 将量化模型转换为eval模式
quantized_model.eval()

# 评估量化模型
# ...

In the above code, we first create an instance of a model (using a pre-trained ResNet-18 model), then we create QuantStub and DeQuantStub objects, and wrap the model and these two stub objects in a Sequential module.

Next, we use the prepare function to prepare the model for quantization, specifying the quantization configuration. Then we call the quantize function to quantize the model. Finally, we convert the quantized model to eval mode and can use it for evaluation.

Please note that quantization models may lose some accuracy, but can significantly reduce the storage space and computational load of a model, making them suitable for deployment in resource-limited environments.

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