pytorch打印网络结构的实例

Z时代
2024-01-10
分类：综合

最简单的方法当然可以直接print（net），但是这样网络比较复杂的时候效果不太好，看着比较乱；以前使用caffe的时候有一个网站可以在线生成网络框图，tensorflow可以用tensor board，keras中可以用model.summary()、或者plot_model()。pytorch没有这样的API，但是可以用代码来完成。

（1）安装环境：graphviz

conda install -n pytorch python-graphviz

或：

sudo apt-get install graphviz

或者从官网下载，按此教程。

（2）生成网络结构的代码：


def make_dot(var, params=None):
  """ Produces Graphviz representation of PyTorch autograd graph
  Blue nodes are the Variables that require grad, orange are Tensors
  saved for backward in torch.autograd.Function
  Args:
    var: output Variable
    params: dict of (name, Variable) to add names to node that
      require grad (TODO: make optional)
  """
  if params is not None:
    assert isinstance(params.values()[0], Variable)
    param_map = {id(v): k for k, v in params.items()}
  node_attr = dict(style='filled',
           shape='box',
           align='left',
           fontsize='12',
           ranksep='0.1',
           height='0.2')
  dot = Digraph(node_attr=node_attr, graph_attr=dict(size="12,12"))
  seen = set()
  def size_to_str(size):
    return '('+(', ').join(['%d' % v for v in size])+')'
  def add_nodes(var):
    if var not in seen:
      if torch.is_tensor(var):
        dot.node(str(id(var)), size_to_str(var.size()), fillcolor='orange')
      elif hasattr(var, 'variable'):
        u = var.variable
        name = param_map[id(u)] if params is not None else ''
        node_name = '%s\n %s' % (name, size_to_str(u.size()))
        dot.node(str(id(var)), node_name, fillcolor='lightblue')
      else:
        dot.node(str(id(var)), str(type(var).__name__))
      seen.add(var)
      if hasattr(var, 'next_functions'):
        for u in var.next_functions:
          if u[0] is not None:
            dot.edge(str(id(u[0])), str(id(var)))
            add_nodes(u[0])
      if hasattr(var, 'saved_tensors'):
        for t in var.saved_tensors:
          dot.edge(str(id(t)), str(id(var)))
          add_nodes(t)
  add_nodes(var.grad_fn)
  return dot

（3）打印网络结构：


import torch 
from torch.autograd import Variable 
import torch.nn as nn 
from graphviz import Digraph
class CNN(nn.module):
  def __init__(self):
   ******
   def forward(self,x):
   ******
   return out
*****************************
def make_dot(): #复制上面的代码
*****************************
if __name__ == '__main__': 
  net = CNN() 
  x = Variable(torch.randn(1, 1, 1024,1024)) 
  y = net(x) 
  g = make_dot(y) 
  g.view() 
  params = list(net.parameters()) 
  k = 0 
  for i in params: 
    l = 1 
    print("该层的结构：" + str(list(i.size()))) 
    for j in i.size(): 
      l *= j 
    print("该层参数和：" + str(l)) 
    k = k + l 
  print("总参数数量和：" + str(k))