3 10 多層感知機的簡潔實現

學習**：

import torch

from torch import nn
from torch.nn import init
import numpy as np
import sys
".."
)import d2lzh_pytorch as d2l

num_inputs, num_outputs, num_hiddens =

784,10,
256net = nn.sequential(
d2l.flattenlayer(),
nn.linear(num_inputs, num_hiddens)
,        nn.relu(),
nn.linear(num_hiddens, num_outputs),)
for params in net.parameters():
init.normal_(params, mean=
0, std=
0.01
)

batch_size =

256train_iter, test_iter = d2l.load_data_fashion_mnist(batch_size)
loss = torch.nn.crossentropyloss(
)optimizer = torch.optim.sgd(net.parameters(
), lr=
0.5)
num_epochs =
5d2l.train_ch3(net, train_iter, test_iter, loss, num_epochs, batch_size,
none
,none
, optimizer)

epoch 1, loss 0.0031, train acc 0.699, test acc 0.748

epoch 2, loss 0.0019, train acc 0.822, test acc 0.772
epoch 3, loss 0.0017, train acc 0.842, test acc 0.834
epoch 4, loss 0.0015, train acc 0.857, test acc 0.851
epoch 5, loss 0.0014, train acc 0.865, test acc 0.852

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