深度之眼【Pytorch】--Module、Sequential容器(附Keras的Sequential）

本文主要爲深度之眼pytorch訓練營二期學習筆記，詳細課程內容移步：深度之眼 https://ai.deepshare.net/index

目錄

nn.Module

容器

Sequential

ModuleList

ModuleDict

總結

Keras-LeNet

---

nn.Module

 

 

 

容器

Sequential

import torch
import torchvision
import torch.nn as nn
from collections import OrderedDict

class LeNetSequential(nn.Module):
    def __init__(self, classes):
        super(LeNetSequential, self).__init__()
        self.features = nn.Sequential(
            nn.Conv2d(3, 6, 5),
            nn.ReLU(),
            nn.MaxPool2d(kernel_size=2, stride=2),
            nn.Conv2d(6, 16, 5),
            nn.ReLU(),
            nn.MaxPool2d(kernel_size=2, stride=2),)

        self.classifier = nn.Sequential(
            nn.Linear(16*5*5, 120),
            nn.ReLU(),
            nn.Linear(120, 84),
            nn.ReLU(),
            nn.Linear(84, classes),)

    def forward(self, x):
        x = self.features(x)
        x = x.view(x.size()[0], -1)
        x = self.classifier(x)
        return x


class LeNetSequentialOrderDict(nn.Module):
    def __init__(self, classes):
        super(LeNetSequentialOrderDict, self).__init__()

        self.features = nn.Sequential(OrderedDict({
            'conv1': nn.Conv2d(3, 6, 5),
            'relu1': nn.ReLU(inplace=True),
            'pool1': nn.MaxPool2d(kernel_size=2, stride=2),

            'conv2': nn.Conv2d(6, 16, 5),
            'relu2': nn.ReLU(inplace=True),
            'pool2': nn.MaxPool2d(kernel_size=2, stride=2),
        }))

        self.classifier = nn.Sequential(OrderedDict({
            'fc1': nn.Linear(16*5*5, 120),
            'relu3': nn.ReLU(),

            'fc2': nn.Linear(120, 84),
            'relu4': nn.ReLU(inplace=True),

            'fc3': nn.Linear(84, classes),
        }))

    def forward(self, x):
        x = self.features(x)
        x = x.view(x.size()[0], -1)
        x = self.classifier(x)
        return x


# net = LeNetSequential(classes=2)
# net = LeNetSequentialOrderDict(classes=2)
#
# fake_img = torch.randn((4, 3, 32, 32), dtype=torch.float32)
#
# output = net(fake_img)
#
# print(net)
# print(output)

ModuleList

class ModuleList(nn.Module):
    def __init__(self):
        super(ModuleList, self).__init__()
        self.linears = nn.ModuleList([nn.Linear(10, 10) for i in range(20)])

    def forward(self, x):
        for i, linear in enumerate(self.linears):
            x = linear(x)
        return x

# net = ModuleList()
#
# print(net)
#
# fake_data = torch.ones((10, 10))
#
# output = net(fake_data)
#
# print(output)

ModuleDict

class ModuleDict(nn.Module):
    def __init__(self):
        super(ModuleDict, self).__init__()
        self.choices = nn.ModuleDict({
            'conv': nn.Conv2d(10, 10, 3),
            'pool': nn.MaxPool2d(3)
        })

        self.activations = nn.ModuleDict({
            'relu': nn.ReLU(),
            'prelu': nn.PReLU()
        })

    def forward(self, x, choice, act):
        x = self.choices[choice](x)
        x = self.activations[act](x)
        return x

net = ModuleDict()

fake_img = torch.randn((4, 10, 32, 32))

output = net(fake_img, 'conv', 'relu')

print(output)

總結

 

Keras-LeNet

import keras
from keras.models import Sequential
from keras.layers import Dense, Activation, Conv2D, MaxPooling2D, Flatten
from keras.optimizers import Adam


model = Sequential()
model.add(Conv2D(input_shape=(28, 28, 1), kernel_size=(5, 5), filters=20, activation='relu'))
model.add(MaxPooling2D(pool_size=(2,2), strides=2, padding='same'))

model.add(Conv2D(kernel_size=(5, 5), filters=50,  activation='relu', padding='same'))
model.add(MaxPooling2D(pool_size=(2,2), strides=2, padding='same'))

model.add(Flatten())
model.add(Dense(500, activation='relu'))
model.add(Dense(10, activation='softmax'))
model.compile(optimizer='rmsprop', loss='categorical_crossentropy', metrics=['accuracy'])