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LAI_mix_gaussian_cl.py
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LAI_mix_gaussian_cl.py
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from __future__ import (division, print_function, )
from collections import OrderedDict
from scipy.stats import multivariate_normal
import numpy.random as npr
import numpy as np
import utils
from itertools import *
from fuel import config
from fuel.datasets import H5PYDataset, IndexableDataset
from fuel.transformers.defaults import uint8_pixels_to_floatX
from fuel.utils import find_in_data_path
from fuel.streams import DataStream
from fuel.schemes import ShuffledScheme
import torch
import torch.nn as nn
import torch.autograd as autograd
import torch.optim as optim
import torchvision
import torchvision.transforms as transforms
from torch.autograd import Variable
import torch.nn.functional as F
from torch.utils.data import Dataset
import scipy.misc
import imageio
import matplotlib.gridspec as gridspec
import os, time, pickle
import matplotlib
matplotlib.use('agg')
import matplotlib.pyplot as plt
plt.switch_backend('agg')
import Gaussian_Sample as GS
"""Generator"""
class Generator(nn.Module):
def __init__(self, G_dim = 400):
super(Generator, self).__init__()
self.input_dim = 2
self.hid_dim = G_dim
self.output_dim = 2
self.fc = nn.Sequential(
nn.Linear(self.input_dim, self.hid_dim, bias=True),
nn.BatchNorm1d(self.hid_dim),
nn.ReLU(),
nn.Linear(self.hid_dim, self.hid_dim, bias=True),
nn.BatchNorm1d(self.hid_dim),
nn.ReLU(),
nn.Linear(self.hid_dim, self.hid_dim, bias=True),
nn.BatchNorm1d(self.hid_dim),
nn.ReLU(),
nn.Linear(self.hid_dim, self.hid_dim, bias=True),
nn.BatchNorm1d(self.hid_dim),
nn.ReLU(),
nn.Linear(self.hid_dim, self.output_dim, bias=True),
)
utils.initialize_weights(self)
def forward(self, z):
x = self.fc(z)
return x
"""FeatureExtrator"""
class FeatureExtrator(nn.Module):
def __init__(self, D_dim = 200, maxout_pieces = 5):
super(FeatureExtrator, self).__init__()
self.input_dim = 2
self.hid_dim = D_dim
self.maxout_pieces = maxout_pieces
self.output_dim = D_dim
# TODO
# This is a naive maxout implementation. Should be updated later.
self.fc = nn.Sequential(
nn.Linear(self.input_dim, self.hid_dim * self.maxout_pieces),
)
self.fcmax1 = nn.Sequential(
nn.Linear(self.hid_dim, self.hid_dim * self.maxout_pieces),
)
self.fcmax2 = nn.Sequential(
nn.Linear(self.hid_dim, self.hid_dim * self.maxout_pieces),
)
utils.initialize_weights(self)
def forward(self, input):
x = self.fc(input)
x = x.view(-1, self.maxout_pieces, self.hid_dim)
x = torch.max(x, 1)[0] # maxout layer 1
x = self.fcmax1(x)
x = x.view(-1, self.maxout_pieces, self.hid_dim)
x = torch.max(x, 1)[0] # maxout layer 2
x = self.fcmax2(x)
x = x.view(-1, self.maxout_pieces, self.output_dim)
x = torch.max(x, 1)[0] # maxout layer 3
return x
"""Encoder"""
class Encoder(nn.Module):
def __init__(self, E_dim = 200):
super(Encoder, self).__init__()
self.input_dim = 2
self.hid_dim = E_dim
self.output_dim = 2
self.fc = nn.Sequential(
nn.Linear(self.hid_dim, self.hid_dim),
nn.BatchNorm1d(self.hid_dim),
nn.ReLU(),
)
self.fc_mu = nn.Sequential(
nn.Linear(self.hid_dim, self.hid_dim),
nn.BatchNorm1d(self.hid_dim),
nn.ReLU(),
nn.Linear(self.hid_dim, self.output_dim),
)
self.fc_sigma = nn.Sequential(
nn.Linear(self.hid_dim, self.hid_dim),
nn.BatchNorm1d(self.hid_dim),
nn.ReLU(),
nn.Linear(self.hid_dim, self.output_dim),
)
utils.initialize_weights(self)
def forward(self, input):
x= self.fc(input)
mu = self.fc_mu(x)
sigma = self.fc_sigma(x)
return mu,sigma
"""Discriminator"""
class Discriminator(nn.Module):
def __init__(self, D_dim = 200, maxout_pieces = 5):
super(Discriminator, self).__init__()
self.input_dim = 2
self.hid_dim = D_dim
self.maxout_pieces = maxout_pieces
self.output_dim = 1
self.fo = nn.Sequential(
nn.Linear(self.hid_dim, self.hid_dim),
nn.BatchNorm1d(self.hid_dim),
nn.LeakyReLU(0.1),
nn.Linear(self.hid_dim, self.output_dim),
nn.Sigmoid(),
)
utils.initialize_weights(self)
def forward(self, input):
x = self.fo(input)
return x
class LAI_mg_cl(object):
def __init__(self, args):
# parameters
self.root = args.root
self.epoch = args.epoch
self.batch_size = args.batch_size
self.save_dir = args.save_dir
self.result_dir = args.result_dir
self.log_dir = args.log_dir
self.model_name = "MixedGaussianExample"
self.z_dim = 2
self.prior = args.prior
"""Generate data"""
train_data, valid_data = GS.main()
train_dataset = GS.Gaussian_Data(train_data)
valid_dataset = GS.Gaussian_Data(valid_data)
self.train_loader = torch.utils.data.DataLoader(dataset=train_dataset,
batch_size=self.batch_size,
shuffle=True)
self.valid_loader = torch.utils.data.DataLoader(dataset=valid_dataset,
batch_size=self.batch_size,
shuffle=False)
self.G = Generator()
self.E = Encoder()
self.D = Discriminator()
self.FC = FeatureExtrator()
self.G_optimizer = optim.Adam(self.G.parameters(), lr=args.lrG, betas=(args.beta1, args.beta2), weight_decay=args.weight_decay)
self.D_optimizer = optim.Adam(chain(self.D.parameters(), self.FC.parameters()), lr=args.lrD, betas=(args.beta1, args.beta2), weight_decay=args.weight_decay)
self.E_optimizer = optim.Adam(self.E.parameters(), lr=args.lrE, betas=(args.beta1, args.beta2), weight_decay=args.weight_decay)
self.lr_decay = args.lr_decay
self.grad_clip = args.grad_clip
self.grad_clip_val = args.grad_clip_val
if torch.cuda.is_available():
self.G.cuda()
self.D.cuda()
self.E.cuda()
self.FC.cuda()
self.BCE_loss = nn.BCELoss().cuda()
else:
self.BCE_loss = nn.BCELoss()
print('---------- Networks architecture -------------')
utils.print_network(self.G)
utils.print_network(self.D)
utils.print_network(self.E)
utils.print_network(self.FC)
print('-----------------------------------------------')
def __reset_grad(self):
self.E_optimizer.zero_grad()
self.G_optimizer.zero_grad()
self.D_optimizer.zero_grad()
def train(self):
self.train_hist = {}
self.train_hist['D_loss'] = []
self.train_hist['G_loss'] = []
self.train_hist['E_loss'] = []
self.train_hist['per_epoch_time'] = []
self.train_hist['total_time'] = []
if torch.cuda.is_available():
self.y_real_, self.y_fake_ = Variable(torch.ones(self.batch_size, 1).cuda()), Variable(torch.zeros(self.batch_size, 1).cuda())
else:
self.y_real_, self.y_fake_ = Variable(torch.ones(self.batch_size, 1)), Variable(torch.zeros(self.batch_size, 1))
self.D.train()
print('training start!!')
start_time = time.time()
for epoch in range(self.epoch):
# reset training mode of G and E
self.G.train()
self.E.train()
self.FC.train()
epoch_start_time = time.time()
E_err = []
D_err = []
G_err = []
for iter, (X, _) in enumerate(self.train_loader):
X = utils.to_var(X)
"""Discriminator"""
z = utils.generate_z(self.batch_size, self.z_dim, self.prior)
X_hat = self.G(z)
D_real = self.D(self.FC(X))
D_fake = self.D(self.FC(X_hat))
D_loss = self.BCE_loss(D_real, self.y_real_) + self.BCE_loss(D_fake, self.y_fake_)
self.train_hist['D_loss'].append(D_loss.data[0])
D_err.append(D_loss.data[0])
# Optimize
D_loss.backward()
if self.grad_clip:
torch.nn.utils.clip_grad_norm(chain(self.D.parameters(), self.FC.parameters()), self.grad_clip_val)
self.D_optimizer.step()
self.__reset_grad()
# """Encoder"""
# z = utils.generate_z(self.batch_size, self.z_dim, self.prior)
# X_hat = self.G(z)
# z_mu, z_sigma = self.E(self.FC(X_hat))
# # - loglikehood
# E_loss = torch.mean(torch.mean(0.5 * (z - z_mu) ** 2 * torch.exp(-z_sigma) + 0.5 * z_sigma + 0.5 * np.log(2*np.pi), 1))
# self.train_hist['E_loss'].append(E_loss.data[0])
# E_err.append(E_loss.data[0])
# # Optimize
# E_loss.backward()
# self.E_optimizer.step()
# self.__reset_grad()
"""Generator"""
# Use both Discriminator and Encoder to update Generator
z = utils.generate_z(self.batch_size, self.z_dim, self.prior)
X_hat = self.G(z)
D_fake = self.D(self.FC(X_hat))
z_mu, z_sigma = self.E(self.FC(X_hat))
E_loss = torch.mean(torch.mean(0.5 * (z - z_mu) ** 2 * torch.exp(-z_sigma) + 0.5 * z_sigma + 0.5 * np.log(2*np.pi), 1))
G_loss = self.BCE_loss(D_fake, self.y_real_)
total_loss = G_loss + E_loss
self.train_hist['G_loss'].append(G_loss.data[0])
G_err.append(G_loss.data[0])
E_err.append(E_loss.data[0])
# Optimize
total_loss.backward()
if self.grad_clip:
torch.nn.utils.clip_grad_norm(self.G.parameters(), self.grad_clip_val)
torch.nn.utils.clip_grad_norm(self.E.parameters(), self.grad_clip_val)
self.G_optimizer.step()
self.E_optimizer.step()
self.__reset_grad()
"""Plot"""
if (iter + 1) == self.train_loader.dataset.__len__() // self.batch_size:
print('Epoch-{}; D_loss: {:.4}; G_loss: {:.4}; E_loss: {:.4}\n'
.format(epoch+1, np.mean(D_err), np.mean(G_err), np.mean(E_err)))
self.visualize_results(epoch+1)
break
self.train_hist['per_epoch_time'].append(time.time() - epoch_start_time)
# learning rate decay
if self.lr_decay:
rate = np.sqrt(epoch+1)/np.sqrt(epoch+2)
self.G_optimizer.param_groups[0]['lr'] *= rate
self.D_optimizer.param_groups[0]['lr'] *= rate
self.E_optimizer.param_groups[0]['lr'] *= rate
print("learning rate change!")
# Save model
if (epoch+1) % 20 == 0:
self.save()
self.train_hist['total_time'].append(time.time() - start_time)
print("Avg one epoch time: %.2f, total %d epochs time: %.2f" % (np.mean(self.train_hist['per_epoch_time']),
self.epoch, self.train_hist['total_time'][0]))
print("Training finish!... save training results")
self.save()
def count(self, xx):
import itertools
import collections
#X = [-2.5, -2, -1.5, -1, -0.5, 0, 0.5, 1, 1.5, 2]
# Y = [-700, 700, 0, -1400, 1400]
# MEANS = []
# for x in X:
# MEANS.append(np.array([x] * 700 + [0]*500))
#VARIANCES = [0.05 ** 2 * np.eye(len(mean)) for mean in MEANS]
#MEANS = [x + [0] * 500 for x in MEANS]
MEANS = [np.array([i, j]) for i, j in itertools.product(range(-4, 5, 2),
range(-4, 5, 2))]
VARIANCES = [0.05 ** 2 * np.eye(len(mean)) for mean in MEANS]
SIGMA = 0.05
l2_store = []
for x_ in xx:
l2_store.append([np.sum((x_ - i) ** 2) for i in MEANS])
mode = np.argmin(l2_store, 1).flatten().tolist()
dis_ = [l2_store[j][i] for j, i in enumerate(mode)]
loglikehood_list = [-0.5 * (dis_[j]/SIGMA**2 + np.log(2*np.pi*SIGMA**2)) for j, _ in enumerate(xx)]
print(loglikehood_list[:10])
loglikehood = np.mean(loglikehood_list)
print(np.sqrt(dis_[0]))
mode_counter = [mode[i] for i in range(len(mode)) if (np.sqrt(dis_[i])) <= 3 * SIGMA]
print('Number of Modes Captured: ', len(collections.Counter(mode_counter)))
print('Number of Points Falling Within 3 std. of the Nearest Mode ', np.sum(
collections.Counter(mode_counter).values()))
print('Loglikehood is: ', loglikehood)
def visualize_results(self, epoch):
self.G.eval()
self.E.eval()
self.FC.eval()
save_dir = os.path.join(self.root, self.result_dir, 'mixed_gaussian', self.model_name)
if not os.path.exists(save_dir):
os.makedirs(save_dir)
# Store results
Recon = []
Original = []
Z = []
Random = []
color_vec = []
for iter, (X, label) in enumerate(self.valid_loader):
z = utils.to_var(torch.randn(self.batch_size, self.z_dim))
X = utils.to_var(X)
label = utils.to_var(label)
z_mu, z_sigma = self.E(self.FC(X))
X_reconstruc = self.G(z_mu)
X_random = self.G(z)
Original += [x for x in utils.to_np(X)]
Recon += [x for x in utils.to_np(X_reconstruc)]
Z += [x for x in utils.to_np(z_mu)]
Random += [x for x in utils.to_np(X_random)]
color_vec+= [x for x in utils.to_np(label)]
Original = np.array(Original)
Recon = np.array(Recon)
Z = np.array(Z)
Random = np.array(Random)
self.count(Random[:2500])
cmap = plt.get_cmap('gnuplot')
cmap = plt.cm.jet
cmaplist = [cmap(i) for i in range(cmap.N)]
cmap = cmap.from_list('Custom cmap', cmaplist, cmap.N)
fig, ax = plt.subplots(1, 1, figsize=(6, 6))
ax.scatter(Original[:,0], Original[:,1], marker = '.', c=color_vec, cmap=cmap, alpha=0.3)
fig.savefig(os.path.join(save_dir, 'X_original' + '_epoch%03d' % epoch + '.png'))
plt.close()
fig, ax = plt.subplots(1, 1, figsize=(6, 6))
ax.scatter(Recon[:10000,0], Recon[:10000,1], marker = '.', c=color_vec[:10000], cmap=cmap, alpha=0.3)
fig.savefig(os.path.join(save_dir, 'X_reconstruc' + '_epoch%03d' % epoch + '.png'))
plt.close()
fig, ax = plt.subplots(1, 1, figsize=(6, 6))
ax.scatter(Random[:10000,0], Random[:10000,1], marker = '.', alpha=0.3)
fig.savefig(os.path.join(save_dir, 'X_random' + '_epoch%03d' % epoch + '.png'))
plt.close()
fig, ax = plt.subplots(1, 1, figsize=(6, 6))
ax.scatter(Z[:,0], Z[:,1], marker = '.', c=color_vec, cmap=cmap, alpha=0.3)
fig.savefig(os.path.join(save_dir, 'Z_mu' + '_epoch%03d' % epoch + '.png'))
plt.close()
def save(self):
save_dir = os.path.join(self.root, self.save_dir, 'mixed_gaussian', self.model_name)
if not os.path.exists(save_dir):
os.makedirs(save_dir)
torch.save(self.G.state_dict(), os.path.join(save_dir, self.model_name + '_G.pkl'))
torch.save(self.D.state_dict(), os.path.join(save_dir, self.model_name + '_D.pkl'))
torch.save(self.E.state_dict(), os.path.join(save_dir, self.model_name + '_E.pkl'))
with open(os.path.join(save_dir, self.model_name + '_history.pkl'), 'wb') as f:
print("Saving the model...")
pickle.dump(self.train_hist, f)
def load(self):
save_dir = os.path.join(self.root, self.save_dir, self.dataset, self.model_name)
self.G.load_state_dict(torch.load(os.path.join(save_dir, self.model_name + '_G.pkl')))
self.D.load_state_dict(torch.load(os.path.join(save_dir, self.model_name + '_D.pkl')))
self.E.load_state_dict(torch.load(os.path.join(save_dir, self.model_name + '_E.pkl')))