pytorch计算flops
时间: 2023-12-03 09:40:29 浏览: 39
以下是使用pytorch计算flops的方法:
```python
import torch
from torch.autograd import Variable
from ptflops import get_model_complexity_info
# 定义模型
model = YourModel()
# 输入数据的大小
input_size = (3, 224, 224)
# 计算flops
flops, params = get_model_complexity_info(model, input_size, as_strings=True, print_per_layer_stat=True)
# 输出flops和参数数量
print('Flops: ' + flops)
print('Params: ' + params)
```
其中,`YourModel()`需要替换为你自己定义的模型,`input_size`为输入数据的大小,可以根据你的实际情况进行修改。`get_model_complexity_info()`函数会返回模型的flops和参数数量,分别保存在`flops`和`params`中。
需要注意的是,不同的计算方法可能会得到不同的flops值。在引用中提到,使用profile算出来的flops需要乘以2,而thop计算出来的flops则不需要乘以2。因此,在使用不同的计算方法时,需要注意其计算规则的差异。
相关问题
pytorch计算网络模型flops的代码
可以使用下面的代码计算PyTorch模型的FLOPs(浮点操作次数):
```python
import torch
from torch.autograd import Variable
def print_model_parm_flops(model, input_size, custom_layers):
multiply_adds = 1
params = 0
flops = 0
input = Variable(torch.rand(1, *input_size))
def register_hook(module):
def hook(module, input, output):
class_name = str(module.__class__).split(".")[-1].split("'")[0]
if class_name == 'Conv2d':
out_h, out_w = output.size()[2:]
kernel_h, kernel_w = module.kernel_size
in_channels = module.in_channels
out_channels = module.out_channels
if isinstance(module.padding, int):
pad_h = pad_w = module.padding
else:
pad_h, pad_w = module.padding
if isinstance(module.stride, int):
stride_h = stride_w = module.stride
else:
stride_h, stride_w = module.stride
params += out_channels * (in_channels // module.groups) * kernel_h * kernel_w
flops += out_channels * (in_channels // module.groups) * kernel_h * kernel_w * out_h * out_w / (stride_h * stride_w)
elif class_name == 'Linear':
weight_flops = module.weight.nelement() * input[0].nelement() // module.weight.size(1)
bias_flops = module.bias.nelement()
flops = weight_flops + bias_flops
params = weight_flops + bias_flops
elif class_name in custom_layers:
custom_flops, custom_params = custom_layers[class_name](module, input, output)
flops += custom_flops
params += custom_params
else:
print(f"Warning: module {class_name} not implemented")
if not isinstance(module, torch.nn.Sequential) and \
not isinstance(module, torch.nn.ModuleList) and \
not (module == model):
hooks.append(module.register_forward_hook(hook))
# loop through the model architecture and register hooks for each layer
hooks = []
model.apply(register_hook)
# run the input through the model
model(input)
# remove the hooks
for hook in hooks:
hook.remove()
print(f"Number of parameters: {params}")
print(f"Number of FLOPs: {flops}")
return flops, params
```
调用这个函数需要传入模型、输入大小和一个自定义图层字典,其中字典的键是自定义层的名称,值是一个函数,该函数接受模块,输入和输出,返回FLOPs和参数数量。例如,如果您的模型包含一个名为MyLayer的自定义层,则可以将以下内容添加到字典中:
```python
def my_layer_impl(module, input, output):
# compute FLOPs and params for MyLayer
flops = ...
params = ...
return flops, params
custom_layers = {'MyLayer': my_layer_impl}
```
使用示例:
```python
import torchvision.models as models
model = models.resnet18()
input_size = (3, 224, 224)
custom_layers = {}
flops, params = print_model_parm_flops(model, input_size, custom_layers)
```
该函数将打印出模型的参数数量和FLOPs。
pytorch中FLOP FLOPS FLOPs的计算程序
在PyTorch中,可以使用`torch.flops`函数来计算模型的浮点运算量(FLOPS)。
以下是一个使用`torch.flops`函数计算FLOPS的示例程序:
```python
import torch
import torch.nn as nn
class MyModel(nn.Module):
def __init__(self):
super(MyModel, self).__init__()
self.conv1 = nn.Conv2d(3, 64, kernel_size=3, stride=1, padding=1)
self.relu1 = nn.ReLU(inplace=True)
self.conv2 = nn.Conv2d(64, 128, kernel_size=3, stride=1, padding=1)
self.relu2 = nn.ReLU(inplace=True)
self.conv3 = nn.Conv2d(128, 256, kernel_size=3, stride=1, padding=1)
self.relu3 = nn.ReLU(inplace=True)
self.conv4 = nn.Conv2d(256, 512, kernel_size=3, stride=1, padding=1)
self.relu4 = nn.ReLU(inplace=True)
self.conv5 = nn.Conv2d(512, 1024, kernel_size=3, stride=1, padding=1)
self.relu5 = nn.ReLU(inplace=True)
self.fc = nn.Linear(1024, 10)
def forward(self, x):
x = self.conv1(x)
x = self.relu1(x)
x = self.conv2(x)
x = self.relu2(x)
x = self.conv3(x)
x = self.relu3(x)
x = self.conv4(x)
x = self.relu4(x)
x = self.conv5(x)
x = self.relu5(x)
x = x.view(x.size(0), -1)
x = self.fc(x)
return x
model = MyModel()
input = torch.randn(1, 3, 32, 32)
flops = torch.flops(model, (input,))
print("FLOPS:", flops)
```
在这个示例程序中,我们定义了一个名为`MyModel`的模型,并计算了其在输入大小为`(1, 3, 32, 32)`的情况下的FLOPS。最后,打印出计算出的FLOPS值。
需要注意的是,`torch.flops`函数只能计算模型中的浮点运算量,而不能计算模型的参数数量、内存占用等其他指标。