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update for new version of torch

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morvanzhou
2018-11-07 16:08:38 +08:00
parent ce55cc9446
commit 906cf71b6f
1 changed files with 51 additions and 45 deletions
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96
tutorial-contents/504_batch_normalization.py
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@ -11,7 +11,6 @@ import torch
from torch import nn
from torch.nn import init
import torch.utils.data as Data
import torch.nn.functional as F
import matplotlib.pyplot as plt
import numpy as np
@ -24,7 +23,7 @@ BATCH_SIZE = 64
EPOCH = 12
LR = 0.03
N_HIDDEN = 8
ACTIVATION = F.tanh
ACTIVATION = torch.tanh
B_INIT = -0.2 # use a bad bias constant initializer
# training data
@ -48,6 +47,7 @@ train_loader = Data.DataLoader(dataset=train_dataset, batch_size=BATCH_SIZE, shu
plt.scatter(train_x.numpy(), train_y.numpy(), c='#FF9359', s=50, alpha=0.2, label='train')
plt.legend(loc='upper left')
class Net(nn.Module):
def __init__(self, batch_normalization=False):
super(Net, self).__init__()
@ -89,20 +89,20 @@ class Net(nn.Module):
nets = [Net(batch_normalization=False), Net(batch_normalization=True)]
print(*nets) # print net architecture
# print(*nets) # print net architecture
opts = [torch.optim.Adam(net.parameters(), lr=LR) for net in nets]
loss_func = torch.nn.MSELoss()
f, axs = plt.subplots(4, N_HIDDEN+1, figsize=(10, 5))
plt.ion() # something about plotting
plt.show()
def plot_histogram(l_in, l_in_bn, pre_ac, pre_ac_bn):
for i, (ax_pa, ax_pa_bn, ax, ax_bn) in enumerate(zip(axs[0, :], axs[1, :], axs[2, :], axs[3, :])):
for i, (ax_pa, ax_pa_bn, ax, ax_bn) in enumerate(zip(axs[0, :], axs[1, :], axs[2, :], axs[3, :])):
[a.clear() for a in [ax_pa, ax_pa_bn, ax, ax_bn]]
if i == 0: p_range = (-7, 10);the_range = (-7, 10)
else:p_range = (-4, 4);the_range = (-1, 1)
if i == 0:
p_range = (-7, 10);the_range = (-7, 10)
else:
p_range = (-4, 4);the_range = (-1, 1)
ax_pa.set_title('L' + str(i))
ax_pa.hist(pre_ac[i].data.numpy().ravel(), bins=10, range=p_range, color='#FF9359', alpha=0.5);ax_pa_bn.hist(pre_ac_bn[i].data.numpy().ravel(), bins=10, range=p_range, color='#74BCFF', alpha=0.5)
ax.hist(l_in[i].data.numpy().ravel(), bins=10, range=the_range, color='#FF9359');ax_bn.hist(l_in_bn[i].data.numpy().ravel(), bins=10, range=the_range, color='#74BCFF')
@ -111,44 +111,50 @@ def plot_histogram(l_in, l_in_bn, pre_ac, pre_ac_bn):
axs[0, 0].set_ylabel('PreAct');axs[1, 0].set_ylabel('BN PreAct');axs[2, 0].set_ylabel('Act');axs[3, 0].set_ylabel('BN Act')
plt.pause(0.01)
# training
losses = [[], []] # recode loss for two networks
for epoch in range(EPOCH):
print('Epoch: ', epoch)
layer_inputs, pre_acts = [], []
for net, l in zip(nets, losses):
net.eval() # set eval mode to fix moving_mean and moving_var
pred, layer_input, pre_act = net(test_x)
l.append(loss_func(pred, test_y).data[0])
layer_inputs.append(layer_input)
pre_acts.append(pre_act)
net.train() # free moving_mean and moving_var
plot_histogram(*layer_inputs, *pre_acts) # plot histogram
for step, (b_x, b_y) in enumerate(train_loader):
for net, opt in zip(nets, opts): # train for each network
pred, _, _ = net(b_x)
loss = loss_func(pred, b_y)
opt.zero_grad()
loss.backward()
opt.step() # it will also learns the parameters in Batch Normalization
if __name__ == "__main__":
f, axs = plt.subplots(4, N_HIDDEN + 1, figsize=(10, 5))
plt.ion() # something about plotting
plt.show()
# training
losses = [[], []] # recode loss for two networks
plt.ioff()
for epoch in range(EPOCH):
print('Epoch: ', epoch)
layer_inputs, pre_acts = [], []
for net, l in zip(nets, losses):
net.eval() # set eval mode to fix moving_mean and moving_var
pred, layer_input, pre_act = net(test_x)
l.append(loss_func(pred, test_y).data.item())
layer_inputs.append(layer_input)
pre_acts.append(pre_act)
net.train() # free moving_mean and moving_var
plot_histogram(*layer_inputs, *pre_acts) # plot histogram
# plot training loss
plt.figure(2)
plt.plot(losses[0], c='#FF9359', lw=3, label='Original')
plt.plot(losses[1], c='#74BCFF', lw=3, label='Batch Normalization')
plt.xlabel('step');plt.ylabel('test loss');plt.ylim((0, 2000));plt.legend(loc='best')
for step, (b_x, b_y) in enumerate(train_loader):
for net, opt in zip(nets, opts): # train for each network
pred, _, _ = net(b_x)
loss = loss_func(pred, b_y)
opt.zero_grad()
loss.backward()
opt.step() # it will also learns the parameters in Batch Normalization
# evaluation
# set net to eval mode to freeze the parameters in batch normalization layers
[net.eval() for net in nets] # set eval mode to fix moving_mean and moving_var
preds = [net(test_x)[0] for net in nets]
plt.figure(3)
plt.plot(test_x.data.numpy(), preds[0].data.numpy(), c='#FF9359', lw=4, label='Original')
plt.plot(test_x.data.numpy(), preds[1].data.numpy(), c='#74BCFF', lw=4, label='Batch Normalization')
plt.scatter(test_x.data.numpy(), test_y.data.numpy(), c='r', s=50, alpha=0.2, label='train')
plt.legend(loc='best')
plt.show()
plt.ioff()
# plot training loss
plt.figure(2)
plt.plot(losses[0], c='#FF9359', lw=3, label='Original')
plt.plot(losses[1], c='#74BCFF', lw=3, label='Batch Normalization')
plt.xlabel('step');plt.ylabel('test loss');plt.ylim((0, 2000));plt.legend(loc='best')
# evaluation
# set net to eval mode to freeze the parameters in batch normalization layers
[net.eval() for net in nets] # set eval mode to fix moving_mean and moving_var
preds = [net(test_x)[0] for net in nets]
plt.figure(3)
plt.plot(test_x.data.numpy(), preds[0].data.numpy(), c='#FF9359', lw=4, label='Original')
plt.plot(test_x.data.numpy(), preds[1].data.numpy(), c='#74BCFF', lw=4, label='Batch Normalization')
plt.scatter(test_x.data.numpy(), test_y.data.numpy(), c='r', s=50, alpha=0.2, label='train')
plt.legend(loc='best')
plt.show()