# np.random.seed(1)
# gmm = GaussianMixture(n_components=5, covariance_type='spherical')
# gmm.means_ = np.array([[10], [20], [60], [80], [110]])
# gmm.covariances_ = np.array([[3], [3], [2], [2], [1]]) ** 2
# gmm.weights_ = np.array([0.2, 0.2, 0.2, 0.2, 0.2])
# X = gmm.sample(2000)
# data = X[0]
# data = (data - min(X[0]))/(max(X[0])-min(X[0]))
# plt.hist(data, 200000, density=False, histtype='stepfilled', alpha=1)
train_data = pd.read_csv('data/testone.csv')
transformer = DataTransformer()
discrete_columns = tuple()
num_gen = train_data.shape[1]
transformer.fit(train_data, discrete_columns)
train_data = transformer.transform(train_data)
# In[4]:
class formerNet(torch.nn.Module):
def __init__(self):
"""
In the constructor we instantiate five parameters and assign them as members.
"""
super().__init__()
self.former = torch.nn.Sequential(torch.nn.Linear(Z_dim, h_dim),
torch.nn.BatchNorm1d(h_dim),
torch.nn.PReLU())
class CTGANSynthesizer(object):
"""Conditional Table GAN Synthesizer.
This is the core class of the CTGAN project, where the different components
are orchestrated together.
For more details about the process, please check the [Modeling Tabular data using
Conditional GAN](https://arxiv.org/abs/1907.00503) paper.
Args:
embedding_dim (int):
Size of the random sample passed to the Generator. Defaults to 128.
gen_dim (tuple or list of ints):
Size of the output samples for each one of the Residuals. A Resiudal Layer
will be created for each one of the values provided. Defaults to (256, 256).
dis_dim (tuple or list of ints):
Size of the output samples for each one of the Discriminator Layers. A Linear Layer
will be created for each one of the values provided. Defaults to (256, 256).
l2scale (float):
Wheight Decay for the Adam Optimizer. Defaults to 1e-6.
batch_size (int):
Number of data samples to process in each step.
"""
def __init__(self,
embedding_dim=128,
gen_dim=(256, 256),
dis_dim=(256, 256),
l2scale=1e-6,
batch_size=500):
self.embedding_dim = embedding_dim
self.gen_dim = gen_dim
self.dis_dim = dis_dim
self.l2scale = l2scale
self.batch_size = batch_size
self.device = torch.device(
"cuda:0" if torch.cuda.is_available() else "cpu")
def _apply_activate(self, data):
data_t = []
st = 0
for item in self.transformer.output_info:
if item[1] == 'tanh':
ed = st + item[0]
data_t.append(torch.tanh(data[:, st:ed]))
st = ed
elif item[1] == 'softmax':
ed = st + item[0]
data_t.append(
functional.gumbel_softmax(data[:, st:ed], tau=0.2))
st = ed
else:
assert 0
return torch.cat(data_t, dim=1)
def _cond_loss(self, data, c, m):
loss = []
st = 0
st_c = 0
skip = False
for item in self.transformer.output_info:
if item[1] == 'tanh':
st += item[0]
skip = True
elif item[1] == 'softmax':
if skip:
skip = False
st += item[0]
continue
ed = st + item[0]
ed_c = st_c + item[0]
tmp = functional.cross_entropy(data[:, st:ed],
torch.argmax(c[:, st_c:ed_c],
dim=1),
reduction='none')
loss.append(tmp)
st = ed
st_c = ed_c
else:
assert 0
loss = torch.stack(loss, dim=1)
return (loss * m).sum() / data.size()[0]
def fit(self,
train_data,
weekday_percentage,
discrete_columns=tuple(),
epochs=300,
log_frequency=True):
"""Fit the CTGAN Synthesizer models to the training data.
Args:
train_data (numpy.ndarray or pandas.DataFrame):
Training Data. It must be a 2-dimensional numpy array or a
pandas.DataFrame.
discrete_columns (list-like):
List of discrete columns to be used to generate the Conditional
Vector. If ``train_data`` is a Numpy array, this list should
contain the integer indices of the columns. Otherwise, if it is
a ``pandas.DataFrame``, this list should contain the column names.
epochs (int):
Number of training epochs. Defaults to 300.
log_frequency (boolean):
Whether to use log frequency of categorical levels in conditional
sampling. Defaults to ``True``.
"""
self.transformer = DataTransformer()
self.transformer.fit(train_data, discrete_columns)
train_data = self.transformer.transform(train_data)
data_sampler = Sampler(train_data, self.transformer.output_info)
data_dim = self.transformer.output_dimensions
self.cond_generator = ConditionalGenerator(
train_data, self.transformer.output_info, log_frequency)
self.generator = Generator(
self.embedding_dim + self.cond_generator.n_opt, self.gen_dim,
data_dim).to(self.device)
discriminator = Discriminator(data_dim + self.cond_generator.n_opt,
self.dis_dim).to(self.device)
optimizerG = optim.Adam(self.generator.parameters(),
lr=2e-4,
betas=(0.5, 0.9),
weight_decay=self.l2scale)
optimizerD = optim.Adam(discriminator.parameters(),
lr=2e-4,
betas=(0.5, 0.9))
assert self.batch_size % 2 == 0
mean = torch.zeros(self.batch_size,
self.embedding_dim,
device=self.device)
std = mean + 1
steps_per_epoch = max(len(train_data) // self.batch_size, 1)
print("Number of training steps per epoch is {} for batch size {}\n".
format(steps_per_epoch, self.batch_size))
for epoch in range(epochs):
for id_ in range(steps_per_epoch):
fakez = torch.normal(mean=mean, std=std)
condvec = self.cond_generator.sample(self.batch_size)
if condvec is None:
c1, m1, col, opt = None, None, None, None
real = data_sampler.sample(self.batch_size, col, opt)
else:
c1, m1, col, opt = condvec
c1 = torch.from_numpy(c1).to(self.device)
m1 = torch.from_numpy(m1).to(self.device)
fakez = torch.cat([fakez, c1], dim=1)
perm = np.arange(self.batch_size)
np.random.shuffle(perm)
real = data_sampler.sample(self.batch_size, col[perm],
opt[perm])
c2 = c1[perm]
fake = self.generator(fakez)
fakeact = self._apply_activate(fake)
real = torch.from_numpy(real.astype('float32')).to(self.device)
if c1 is not None:
fake_cat = torch.cat([fakeact, c1], dim=1)
real_cat = torch.cat([real, c2], dim=1)
else:
real_cat = real
fake_cat = fake
y_fake = discriminator(fake_cat)
y_real = discriminator(real_cat)
pen = discriminator.calc_gradient_penalty(
real_cat, fake_cat, self.device)
loss_d = -(torch.mean(y_real) - torch.mean(y_fake))
optimizerD.zero_grad()
pen.backward(retain_graph=True)
loss_d.backward()
optimizerD.step()
fakez = torch.normal(mean=mean, std=std)
condvec = self.cond_generator.sample(self.batch_size)
if condvec is None:
c1, m1, col, opt = None, None, None, None
else:
c1, m1, col, opt = condvec
c1 = torch.from_numpy(c1).to(self.device)
m1 = torch.from_numpy(m1).to(self.device)
fakez = torch.cat([fakez, c1], dim=1)
fake = self.generator(fakez)
fakeact = self._apply_activate(fake)
if c1 is not None:
y_fake = discriminator(torch.cat([fakeact, c1], dim=1))
else:
y_fake = discriminator(fakeact)
if condvec is None:
cross_entropy = 0
else:
cross_entropy = self._cond_loss(fake, c1, m1)
loss_g = -torch.mean(y_fake) + cross_entropy
optimizerG.zero_grad()
loss_g.backward()
optimizerG.step()
print("Epoch %d, Loss G: %.4f, Loss D: %.4f" %
(epoch + 1, loss_g.detach().cpu(), loss_d.detach().cpu()),
flush=True)
self.evaluate_model(epoch, weekday_percentage)
def evaluate_model(self, epoch, weekday_percentage):
# create some genrated samples using the generator model
gen_samples = self.sample(18000)
gen_weekday_percentage = gen_samples['weekday'].value_counts(
normalize=True)
# sort series by the weekday name
weekday_percentage = weekday_percentage.sort_index(ascending=True)
gen_weekday_percentage = gen_weekday_percentage.sort_index(
ascending=True)
score = mean_squared_error(weekday_percentage, gen_weekday_percentage)
print("Evaluation after epoch {} is {}\n".format(epoch + 1, score))
def sample(self, n):
"""Sample data similar to the training data.
Args:
n (int):
Number of rows to sample.
Returns:
numpy.ndarray or pandas.DataFrame
"""
steps = n // self.batch_size + 1
data = []
for i in range(steps):
mean = torch.zeros(self.batch_size, self.embedding_dim)
std = mean + 1
fakez = torch.normal(mean=mean, std=std).to(self.device)
condvec = self.cond_generator.sample_zero(self.batch_size)
if condvec is None:
pass
else:
c1 = condvec
c1 = torch.from_numpy(c1).to(self.device)
fakez = torch.cat([fakez, c1], dim=1)
fake = self.generator(fakez)
fakeact = self._apply_activate(fake)
data.append(fakeact.detach().cpu().numpy())
data = np.concatenate(data, axis=0)
data = data[:n]
return self.transformer.inverse_transform(data, None)
class CTGANSynthesizer(object):
"""Conditional Table GAN Synthesizer.
This is the core class of the CTGAN project, where the different components
are orchestrated together.
For more details about the process, please check the [Modeling Tabular data using
Conditional GAN](https://arxiv.org/abs/1907.00503) paper.
Args:
embedding_dim (int):
Size of the random sample passed to the Generator. Defaults to 128.
gen_dim (tuple or list of ints):
Size of the output samples for each one of the Residuals. A Resiudal Layer
will be created for each one of the values provided. Defaults to (256, 256).
dis_dim (tuple or list of ints):
Size of the output samples for each one of the Discriminator Layers. A Linear Layer
will be created for each one of the values provided. Defaults to (256, 256).
l2scale (float):
Wheight Decay for the Adam Optimizer. Defaults to 1e-6.
batch_size (int):
Number of data samples to process in each step.
"""
def __init__(self,
embedding_dim=128,
gen_dim=(256, 256),
dis_dim=(256, 256),
l2scale=1e-6,
batch_size=500):
self.embedding_dim = embedding_dim
self.gen_dim = gen_dim
self.dis_dim = dis_dim
self.l2scale = l2scale
self.batch_size = batch_size
self.device = torch.device(
"cuda:0" if torch.cuda.is_available() else "cpu")
def _apply_activate(self, data):
data_t = []
st = 0
for item in self.transformer.output_info:
if item[1] == 'tanh':
ed = st + item[0]
data_t.append(torch.tanh(data[:, st:ed]))
st = ed
elif item[1] == 'softmax':
ed = st + item[0]
data_t.append(
functional.gumbel_softmax(data[:, st:ed], tau=0.2))
st = ed
else:
assert 0
return torch.cat(data_t, dim=1)
def _cond_loss(self, data, c, m):
loss = []
st = 0
st_c = 0
skip = False
for item in self.transformer.output_info:
if item[1] == 'tanh':
st += item[0]
skip = True
elif item[1] == 'softmax':
if skip:
skip = False
st += item[0]
continue
ed = st + item[0]
ed_c = st_c + item[0]
tmp = functional.cross_entropy(data[:, st:ed],
torch.argmax(c[:, st_c:ed_c],
dim=1),
reduction='none')
loss.append(tmp)
st = ed
st_c = ed_c
else:
assert 0
loss = torch.stack(loss, dim=1)
return (loss * m).sum() / data.size()[0]
def fit(self,
train_data,
prefered_label,
black_box_path,
discrete_columns=tuple(),
conditional_cols=None,
epochs=300,
log_frequency=True):
"""Fit the CTGAN Synthesizer models to the training data.
Args:
train_data (numpy.ndarray or pandas.DataFrame):
Training Data. It must be a 2-dimensional numpy array or a
pandas.DataFrame.
discrete_columns (list-like):
List of discrete columns to be used to generate the Conditional
Vector. If ``train_data`` is a Numpy array, this list should
contain the integer indices of the columns. Otherwise, if it is
a ``pandas.DataFrame``, this list should contain the column names.
epochs (int):
Number of training epochs. Defaults to 300.
log_frequency (boolean):
Whether to use log frequency of categorical levels in conditional
sampling. Defaults to ``True``.
"""
self.prefered_label = prefered_label
self.blackbox_model = pickle.load(open(black_box_path, "rb"))
self.transformer = DataTransformer()
self.transformer.fit(train_data, discrete_columns)
train_data = self.transformer.transform(train_data)
data_sampler = Sampler(train_data, self.transformer.output_info)
data_dim = self.transformer.output_dimensions
self.cond_generator = ConditionalGenerator(
train_data, self.transformer.output_info, log_frequency,
conditional_cols)
self.generator = Generator(
self.embedding_dim + self.cond_generator.n_opt, self.gen_dim,
data_dim).to(self.device)
discriminator = Discriminator(data_dim, self.dis_dim,
1).to(self.device)
conditonal_discriminator = Discriminator(1 + self.cond_generator.n_opt,
self.dis_dim).to(self.device)
optimizerG = optim.Adam(self.generator.parameters(),
lr=2e-4,
betas=(0.5, 0.9),
weight_decay=self.l2scale)
optimizerD = optim.Adam(discriminator.parameters(),
lr=2e-4,
betas=(0.5, 0.9))
optimizerconditionalD = optim.Adam(
conditonal_discriminator.parameters(), lr=2e-4, betas=(0.5, 0.9))
assert self.batch_size % 2 == 0
mean = torch.zeros(self.batch_size,
self.embedding_dim,
device=self.device)
std = mean + 1
steps_per_epoch = max(len(train_data) // self.batch_size, 1)
for i in range(epochs):
flip_loss_list = []
real_flip_loss_list = []
for id_ in range(steps_per_epoch):
fakez = torch.normal(mean=mean, std=std)
condvec = self.cond_generator.sample(self.batch_size)
if condvec is None:
c1, m1, col, opt = None, None, None, None
real = data_sampler.sample(self.batch_size, col, opt)
else:
c1, m1, col, opt = condvec
c1 = torch.from_numpy(c1).to(self.device)
m1 = torch.from_numpy(m1).to(self.device)
fakez = torch.cat([fakez, c1], dim=1)
perm = np.arange(self.batch_size)
np.random.shuffle(perm)
real = data_sampler.sample(self.batch_size, col[perm],
opt[perm])
c2 = c1[perm]
fake = self.generator(fakez)
fakeact = self._apply_activate(fake)
if condvec is None:
cross_entropy = 0
else:
cross_entropy = self._cond_loss(fake, c1, m1)
real = torch.from_numpy(real.astype('float32')).to(self.device)
if c1 is not None:
real_cat = real
fake_cat = fakeact
else:
real_cat = real
fake_cat = fake
y_fake = discriminator(fake_cat)
y_real = discriminator(real_cat)
if c1 is not None:
conditional_fake_cat = torch.cat([y_fake, c1], dim=1)
conditional_real_cat = torch.cat([y_real, c2], dim=1)
else:
conditional_fake_cat = y_fake
conditional_real_cat = y_real
conditional_y_fake = conditonal_discriminator(
conditional_fake_cat)
conditional_y_real = conditonal_discriminator(
conditional_real_cat)
pen = discriminator.calc_gradient_penalty(
real_cat, fake_cat, self.device)
loss_d = -(torch.mean(y_real) - torch.mean(y_fake))
condtional_pen = conditonal_discriminator.calc_gradient_penalty(
conditional_real_cat, conditional_fake_cat, self.device)
loss_condtional_d = -(torch.mean(conditional_y_real) -
torch.mean(conditional_y_fake))
optimizerD.zero_grad()
pen.backward(retain_graph=True)
loss_d.backward(retain_graph=True)
optimizerD.step()
optimizerconditionalD.zero_grad()
condtional_pen.backward(retain_graph=True)
loss_condtional_d.backward()
optimizerconditionalD.step()
fakez = torch.normal(mean=mean, std=std)
condvec = self.cond_generator.sample(self.batch_size)
if condvec is None:
c1, m1, col, opt = None, None, None, None
else:
c1, m1, col, opt = condvec
c1 = torch.from_numpy(c1).to(self.device)
m1 = torch.from_numpy(m1).to(self.device)
fakez = torch.cat([fakez, c1], dim=1)
fake = self.generator(fakez)
fakeact = self._apply_activate(fake)
if c1 is not None:
y_fake = discriminator(fakeact)
conditional_y_fake = conditonal_discriminator(
torch.cat([y_fake, c1], dim=1))
else:
y_fake = discriminator(fakeact)
conditional_y_fake = conditonal_discriminator(y_fake)
if condvec is None:
cross_entropy = 0
else:
cross_entropy = self._cond_loss(fake, c1, m1)
fake_act_inv = self.transformer.inverse_transform(
fakeact.detach().cpu().numpy(), None)
fake_act_inv = _factorize_categoricals(fake_act_inv,
discrete_columns)
fake_act_inv = xgb.DMatrix(data=fake_act_inv)
black_box_pred_prob = self.blackbox_model.predict(fake_act_inv)
#black_box_pred_prob = torch.from_numpy(np.stack([1-black_box_pred_prob,black_box_pred_prob], axis = -1))
#flip_loss = torch.nn.CrossEntropyLoss()(black_box_pred_prob, torch.tensor([self.prefered_label]).repeat(self.batch_size))
flip_loss = sum(-np.log(black_box_pred_prob)) / self.batch_size
real_inv = self.transformer.inverse_transform(
real.detach().cpu().numpy(), None)
real_inv = _factorize_categoricals(real_inv, discrete_columns)
real_inv = xgb.DMatrix(data=real_inv)
real_pred_prob = self.blackbox_model.predict(real_inv)
#black_box_pred_prob = torch.from_numpy(np.stack([1-black_box_pred_prob,black_box_pred_prob], axis = -1))
#flip_loss = torch.nn.CrossEntropyLoss()(black_box_pred_prob, torch.tensor([self.prefered_label]).repeat(self.batch_size))
real_flip_loss = sum(-np.log(real_pred_prob)) / self.batch_size
loss_g = -torch.mean(
conditional_y_fake) + cross_entropy + 10 * flip_loss
#print(f"Base Loss:{-torch.mean(conditional_y_fake)}, Conditional Loss:{cross_entropy}, 10Flip Loss:{flip_loss}")
flip_loss_list.append(flip_loss)
real_flip_loss_list.append(real_flip_loss)
optimizerG.zero_grad()
loss_g.backward()
optimizerG.step()
print(
f"Generated flip loss {np.mean(flip_loss_list)}, Real flip loss {np.mean(real_flip_loss_list)}"
)
print("Condtional Cross Entropy Loss", cross_entropy)
print(
"Epoch %d, Loss G: %.4f, Loss D: %.4f, Loss Conditional D: %.4f"
% (i + 1, loss_g.detach().cpu(), loss_d.detach().cpu(),
loss_condtional_d.detach().cpu()),
flush=True)
def sample(self, n, col_index=None):
"""Sample data similar to the training data.
Args:
n (int):
Number of rows to sample.
Returns:
numpy.ndarray or pandas.DataFrame
"""
steps = n // self.batch_size + 1
data = []
for i in range(steps):
mean = torch.zeros(self.batch_size, self.embedding_dim)
std = mean + 1
fakez = torch.normal(mean=mean, std=std).to(self.device)
condvec, m1 = self.cond_generator.sample_zero(self.batch_size)
m1 = torch.from_numpy(m1).to(self.device)
if condvec is None:
pass
else:
c1 = condvec
if col_index != None:
c1 = np.zeros_like(c1)
c1[:, col_index] = 1
c1 = torch.from_numpy(c1).to(self.device)
fakez = torch.cat([fakez, c1], dim=1)
fake = self.generator(fakez)
fakeact = self._apply_activate(fake)
data.append(fakeact.detach().cpu().numpy())
print(self._cond_loss(fake, c1, m1))
data = np.concatenate(data, axis=0)
data = data[:n]
return self.transformer.inverse_transform(data, None)