def test_feedforward_theano_mix():
minibatch_size = 100
random_state = np.random.RandomState(1999)
graph = OrderedDict()
X_sym, y_sym = add_datasets_to_graph([X, y], ["X", "y"], graph)
l1_o = linear_layer([X_sym], graph, 'l1', proj_dim=20,
random_state=random_state)
l1_o = .999 * l1_o
y_pred = softmax_layer([l1_o], graph, 'pred', n_classes,
random_state=random_state)
cost = categorical_crossentropy(y_pred, y_sym).mean()
params, grads = get_params_and_grads(graph, cost)
learning_rate = 0.001
opt = sgd(params)
updates = opt.updates(params, grads, learning_rate)
fit_function = theano.function([X_sym, y_sym], [cost], updates=updates,
mode="FAST_COMPILE")
cost_function = theano.function([X_sym, y_sym], [cost],
mode="FAST_COMPILE")
checkpoint_dict = {}
train_indices = np.arange(len(X))
valid_indices = np.arange(len(X))
early_stopping_trainer(fit_function, cost_function, checkpoint_dict, [X, y],
minibatch_size,
train_indices, valid_indices,
fit_function_output_names=["cost"],
cost_function_output_name="valid_cost",
n_epochs=1)
def test_batch_normalization():
random_state = np.random.RandomState(1999)
graph = OrderedDict()
X_sym, y_sym = add_datasets_to_graph([X, y], ["X", "y"], graph,
list_of_test_values=[X, y])
on_off = tensor.iscalar()
on_off.tag.test_value = 1
l1 = relu_layer([X_sym], graph, "proj", proj_dim=5,
batch_normalize=True, mode_switch=on_off,
random_state=random_state)
l2 = relu_layer([l1], graph, "proj2", proj_dim=5,
batch_normalize=True, mode_switch=on_off,
random_state=random_state)
f = theano.function([X_sym, on_off], [l2], mode="FAST_COMPILE")
params, grads = get_params_and_grads(graph, l2.mean())
opt = sgd(params, .1)
updates = opt.updates(params, grads)
train_f = theano.function([X_sym, on_off], [l2], mode="FAST_COMPILE",
updates=updates)
valid_f = theano.function([X_sym, on_off], [l2], mode="FAST_COMPILE")
X1 = random_state.rand(*X.shape)
X2 = np.vstack([X1, .5 * X1])
t1 = train_f(X1, 0)[0]
t2 = valid_f(X1, 1)[0]
t3 = train_f(X2, 0)[0]
t4 = valid_f(X1, 1)[0]
t5 = valid_f(X1, 1)[0]
assert_almost_equal(t4, t5)
assert_raises(AssertionError, assert_almost_equal, t2, t4)
def test_vae():
minibatch_size = 100
random_state = np.random.RandomState(1999)
graph = OrderedDict()
X_sym, y_sym = add_datasets_to_graph([X, y], ["X", "y"], graph)
l1_enc = relu_layer([X_sym, y_sym], graph, 'l1_enc', proj_dim=20,
random_state=random_state)
mu = linear_layer([l1_enc], graph, 'mu', proj_dim=10,
random_state=random_state)
log_sigma = linear_layer([l1_enc], graph, 'log_sigma', proj_dim=10,
random_state=random_state)
samp = gaussian_log_sample_layer([mu], [log_sigma], graph,
'gaussian_log_sample',
random_state=random_state)
l1_dec = relu_layer([samp], graph, 'l1_dec', proj_dim=20,
random_state=random_state)
out = sigmoid_layer([l1_dec], graph, 'out', proj_dim=X.shape[1],
random_state=random_state)
kl = gaussian_log_kl([mu], [log_sigma], graph, 'gaussian_kl').mean()
cost = binary_crossentropy(out, X_sym).mean() + kl
params, grads = get_params_and_grads(graph, cost)
learning_rate = 0.001
opt = sgd(params)
updates = opt.updates(params, grads, learning_rate)
train_function = theano.function([X_sym, y_sym], [cost], updates=updates,
mode="FAST_COMPILE")
iterate_function(train_function, [X, y], minibatch_size,
list_of_output_names=["cost"], n_epochs=1)
def test_tanh_rnn():
# random state so script is deterministic
random_state = np.random.RandomState(1999)
# home of the computational graph
graph = OrderedDict()
# number of hidden features
n_hid = 10
# number of output_features = input_features
n_out = X.shape[-1]
# input (where first dimension is time)
datasets_list = [X, X_mask, y, y_mask]
names_list = ["X", "X_mask", "y", "y_mask"]
test_values_list = [X, X_mask, y, y_mask]
X_sym, X_mask_sym, y_sym, y_mask_sym = add_datasets_to_graph(
datasets_list, names_list, graph, list_of_test_values=test_values_list)
# Setup weights
l1 = linear_layer([X_sym], graph, 'l1_proj', n_hid, random_state)
h = tanh_recurrent_layer([l1], X_mask_sym, n_hid, graph, 'l1_rec',
random_state)
# linear output activation
y_hat = linear_layer([h], graph, 'l2_proj', n_out, random_state)
# error between output and target
cost = squared_error(y_hat, y_sym)
cost = masked_cost(cost, y_mask_sym).mean()
# Parameters of the model
params, grads = get_params_and_grads(graph, cost)
# Use stochastic gradient descent to optimize
opt = sgd(params)
learning_rate = 0.001
updates = opt.updates(params, grads, learning_rate)
fit_function = theano.function([X_sym, X_mask_sym, y_sym, y_mask_sym],
[cost],
updates=updates,
mode="FAST_COMPILE")
cost_function = theano.function([X_sym, X_mask_sym, y_sym, y_mask_sym],
[cost],
mode="FAST_COMPILE")
checkpoint_dict = {}
train_indices = np.arange(X.shape[1])
valid_indices = np.arange(X.shape[1])
early_stopping_trainer(fit_function,
cost_function,
checkpoint_dict, [X, y],
minibatch_size,
train_indices,
valid_indices,
fit_function_output_names=["cost"],
cost_function_output_name="valid_cost",
n_epochs=1)
def test_tanh_rnn():
# random state so script is deterministic
random_state = np.random.RandomState(1999)
# home of the computational graph
graph = OrderedDict()
# number of hidden features
n_hid = 10
# number of output_features = input_features
n_out = X.shape[-1]
# input (where first dimension is time)
datasets_list = [X, X_mask, y, y_mask]
names_list = ["X", "X_mask", "y", "y_mask"]
test_values_list = [X, X_mask, y, y_mask]
X_sym, X_mask_sym, y_sym, y_mask_sym = add_datasets_to_graph(
datasets_list, names_list, graph, list_of_test_values=test_values_list)
# Setup weights
l1 = linear_layer([X_sym], graph, 'l1_proj', proj_dim=n_hid,
random_state=random_state)
h = tanh_recurrent_layer([l1], X_mask_sym, n_hid, graph, 'l1_rec',
random_state)
# linear output activation
y_hat = linear_layer([h], graph, 'l2_proj', proj_dim=n_out,
random_state=random_state)
# error between output and target
cost = squared_error(y_hat, y_sym)
cost = masked_cost(cost, y_mask_sym).mean()
# Parameters of the model
params, grads = get_params_and_grads(graph, cost)
# Use stochastic gradient descent to optimize
learning_rate = 0.001
opt = sgd(params, learning_rate)
updates = opt.updates(params, grads)
fit_function = theano.function([X_sym, X_mask_sym, y_sym, y_mask_sym],
[cost], updates=updates, mode="FAST_COMPILE")
cost_function = theano.function([X_sym, X_mask_sym, y_sym, y_mask_sym],
[cost], mode="FAST_COMPILE")
checkpoint_dict = {}
train_indices = np.arange(X.shape[1])
valid_indices = np.arange(X.shape[1])
early_stopping_trainer(fit_function, cost_function,
train_indices, valid_indices,
checkpoint_dict,
[X, y], minibatch_size,
list_of_train_output_names=["cost"],
valid_output_name="valid_cost",
n_epochs=1)
def test_vae():
minibatch_size = 10
random_state = np.random.RandomState(1999)
graph = OrderedDict()
X_sym = add_datasets_to_graph([X], ["X"], graph)
l1_enc = softplus_layer([X_sym], graph, 'l1_enc', proj_dim=100,
random_state=random_state)
mu = linear_layer([l1_enc], graph, 'mu', proj_dim=50,
random_state=random_state)
log_sigma = linear_layer([l1_enc], graph, 'log_sigma', proj_dim=50,
random_state=random_state)
samp = gaussian_log_sample_layer([mu], [log_sigma], graph,
'gaussian_log_sample',
random_state=random_state)
l1_dec = softplus_layer([samp], graph, 'l1_dec', proj_dim=100,
random_state=random_state)
out = sigmoid_layer([l1_dec], graph, 'out', proj_dim=X.shape[1],
random_state=random_state)
kl = gaussian_log_kl([mu], [log_sigma], graph, 'gaussian_kl').mean()
cost = binary_crossentropy(out, X_sym).mean() + kl
params, grads = get_params_and_grads(graph, cost)
learning_rate = 0.00000
opt = sgd(params, learning_rate)
updates = opt.updates(params, grads)
fit_function = theano.function([X_sym], [cost], updates=updates,
mode="FAST_COMPILE")
cost_function = theano.function([X_sym], [cost],
mode="FAST_COMPILE")
checkpoint_dict = {}
train_indices = np.arange(len(X))
valid_indices = np.arange(len(X))
early_stopping_trainer(fit_function, cost_function,
train_indices, valid_indices,
checkpoint_dict, [X],
minibatch_size,
list_of_train_output_names=["cost"],
valid_output_name="valid_cost",
n_epochs=1)
def test_feedforward_classifier():
minibatch_size = 100
random_state = np.random.RandomState(1999)
graph = OrderedDict()
X_sym, y_sym = add_datasets_to_graph([X, y], ["X", "y"], graph)
l1_o = linear_layer([X_sym], graph, "l1", proj_dim=20, random_state=random_state)
y_pred = softmax_layer([l1_o], graph, "pred", n_classes, random_state=random_state)
cost = categorical_crossentropy(y_pred, y_sym).mean()
params, grads = get_params_and_grads(graph, cost)
learning_rate = 0.001
opt = sgd(params)
updates = opt.updates(params, grads, learning_rate)
train_function = theano.function([X_sym, y_sym], [cost], updates=updates, mode="FAST_COMPILE")
iterate_function(train_function, [X, y], minibatch_size, list_of_output_names=["cost"], n_epochs=1)
def test_fixed_projection_layer():
random_state = np.random.RandomState(1999)
rand_projection = random_state.randn(64, 12)
graph = OrderedDict()
X_sym = add_datasets_to_graph([X], ["X"], graph)
out = fixed_projection_layer([X_sym], rand_projection, graph, 'proj')
out2 = fixed_projection_layer([X_sym],
rand_projection,
graph,
'proj',
pre=rand_projection[:, 0])
out3 = fixed_projection_layer([X_sym],
rand_projection,
graph,
'proj',
post=rand_projection[0])
final = linear_layer([out2],
graph,
'linear',
17,
random_state=random_state)
# Test that it compiles with and without bias
f = theano.function([X_sym], [out, out2, out3, final], mode="FAST_COMPILE")
# Test updates
params, grads = get_params_and_grads(graph, final.mean())
opt = sgd(params)
updates = opt.updates(params, grads, .1)
f2 = theano.function([X_sym], [out2, final], updates=updates)
ret = f(np.ones_like(X))[0]
assert ret.shape[1] != X.shape[1]
ret2 = f(np.ones_like(X))[1]
assert ret.shape[1] != X.shape[1]
out1, final1 = f2(X)
out2, final2 = f2(X)
# Make sure fixed basis is unchanged
assert_almost_equal(out1, out2)
# Make sure linear layer is updated
assert_raises(AssertionError, assert_almost_equal, final1, final2)
def test_fixed_projection_layer():
random_state = np.random.RandomState(1999)
rand_projection = random_state.randn(64, 12)
graph = OrderedDict()
X_sym = add_datasets_to_graph([X], ["X"], graph)
out = fixed_projection_layer([X_sym], rand_projection,
graph, 'proj')
out2 = fixed_projection_layer([X_sym], rand_projection,
graph, 'proj',
pre=rand_projection[:, 0])
out3 = fixed_projection_layer([X_sym], rand_projection,
graph, 'proj',
post=rand_projection[0])
final = linear_layer([out2], graph, 'linear', 17,
random_state=random_state)
# Test that it compiles with and without bias
f = theano.function([X_sym], [out, out2, out3, final],
mode="FAST_COMPILE")
# Test updates
params, grads = get_params_and_grads(
graph, final.mean())
opt = sgd(params, .1)
updates = opt.updates(params, grads)
f2 = theano.function([X_sym], [out2, final],
updates=updates)
ret = f(np.ones_like(X))[0]
assert ret.shape[1] != X.shape[1]
ret2 = f(np.ones_like(X))[1]
assert ret.shape[1] != X.shape[1]
out1, final1 = f2(X)
out2, final2 = f2(X)
# Make sure fixed basis is unchanged
assert_almost_equal(out1, out2)
# Make sure linear layer is updated
assert_raises(AssertionError, assert_almost_equal, final1, final2)
def test_correlated_mixture_density():
# graph holds information necessary to build layers from parents
random_state = np.random.RandomState(1999)
graph = OrderedDict()
X_sym, y_sym = add_datasets_to_graph([bernoulli_X, bernoulli_y], ["X", "y"],
graph)
n_hid = 20
minibatch_size = len(bernoulli_X)
train_indices = np.arange(len(bernoulli_X))
valid_indices = np.arange(len(bernoulli_X))
l1 = tanh_layer([X_sym], graph, 'l1', proj_dim=n_hid,
random_state=random_state)
rval = bernoulli_and_correlated_log_gaussian_mixture_layer(
[l1], graph, 'hw', proj_dim=2, n_components=3,
random_state=random_state)
binary, coeffs, mus, log_sigmas, corr = rval
cost = bernoulli_and_correlated_log_gaussian_mixture_cost(
binary, coeffs, mus, log_sigmas, corr, y_sym).mean()
params, grads = get_params_and_grads(graph, cost)
learning_rate = 1E-6
opt = sgd(params, learning_rate)
updates = opt.updates(params, grads)
fit_function = theano.function([X_sym, y_sym], [cost], updates=updates,
mode="FAST_COMPILE")
cost_function = theano.function([X_sym, y_sym], [cost],
mode="FAST_COMPILE")
checkpoint_dict = create_checkpoint_dict(locals())
epoch_results = fixed_n_epochs_trainer(
fit_function, cost_function, train_indices, valid_indices,
checkpoint_dict, [bernoulli_X, bernoulli_y],
minibatch_size,
list_of_train_output_names=["train_cost"],
valid_output_name="valid_cost",
n_epochs=1)
minibatch_size = 20
n_hid = 1000
l1 = relu_layer([X_sym],
graph,
'l1',
proj_dim=n_hid,
random_state=random_state)
y_pred = softmax_zeros_layer([l1], graph, 'y_pred', proj_dim=n_targets)
nll = categorical_crossentropy(y_pred, y_sym).mean()
weights = get_weights_from_graph(graph)
L2 = sum([(w**2).sum() for w in weights])
cost = nll + .0001 * L2
params, grads = get_params_and_grads(graph, cost)
learning_rate = 1E-4
momentum = 0.95
opt = rmsprop(params, learning_rate, momentum)
updates = opt.updates(params, grads)
fit_function = theano.function([X_sym, y_sym], [cost], updates=updates)
cost_function = theano.function([X_sym, y_sym], [cost])
predict_function = theano.function([X_sym], [y_pred])
checkpoint_dict = create_checkpoint_dict(locals())
def error(*args):
xargs = args[:-1]
code_log_sigma = linear_layer([l2_enc], graph, 'code_log_sigma', n_code,
random_state)
kl = gaussian_log_kl([code_mu], [code_log_sigma], graph, 'kl').mean()
samp = gaussian_log_sample_layer([code_mu], [code_log_sigma], graph, 'samp',
random_state)
# decode path aka p
l1_dec = softplus_layer([samp], graph, 'l1_dec', n_dec_layer[0], random_state)
l2_dec = softplus_layer([l1_dec], graph, 'l2_dec', n_dec_layer[1], random_state)
out = linear_layer([l2_dec], graph, 'out', n_input, random_state)
nll = squared_error(out, X_sym).mean()
# log p(x) = -nll so swap sign
# want to minimize cost in optimization so multiply by -1
cost = -1 * (-nll - kl)
params, grads = get_params_and_grads(graph, cost)
learning_rate = 0.0003
opt = adam(params)
updates = opt.updates(params, grads, learning_rate)
# Checkpointing
try:
checkpoint_dict = load_last_checkpoint()
fit_function = checkpoint_dict["fit_function"]
cost_function = checkpoint_dict["cost_function"]
encode_function = checkpoint_dict["encode_function"]
decode_function = checkpoint_dict["decode_function"]
previous_epoch_results = checkpoint_dict["previous_epoch_results"]
except KeyError:
fit_function = theano.function([X_sym], [nll, kl, nll + kl],
def test_loop():
# graph holds information necessary to build layers from parents
graph = OrderedDict()
X_sym, y_sym = add_datasets_to_graph([X, y], ["X", "y"], graph)
# random state so script is deterministic
random_state = np.random.RandomState(1999)
minibatch_size = 10
y_pred = softmax_zeros_layer([X_sym], graph, "y_pred", proj_dim=n_targets)
nll = categorical_crossentropy(y_pred, y_sym).mean()
weights = get_weights_from_graph(graph)
cost = nll
params, grads = get_params_and_grads(graph, cost)
learning_rate = 0.13
opt = sgd(params, learning_rate)
updates = opt.updates(params, grads)
fit_function = theano.function([X_sym, y_sym], [cost], updates=updates)
cost_function = theano.function([X_sym, y_sym], [cost])
predict_function = theano.function([X_sym], [y_pred])
checkpoint_dict = {
"fit_function": fit_function,
"cost_function": cost_function,
"predict_function": predict_function,
}
def error(*args):
xargs = args[:-1]
y = args[-1]
final_args = xargs
y_pred = predict_function(*final_args)[0]
return 1 - np.mean((np.argmax(y_pred, axis=1).ravel()) == (np.argmax(y, axis=1).ravel()))
TL1 = TrainingLoop(
fit_function,
error,
train_indices[:10],
valid_indices[:10],
minibatch_size,
checkpoint_dict=checkpoint_dict,
list_of_train_output_names=["train_cost"],
valid_output_name="valid_error",
n_epochs=1,
optimizer_object=opt,
)
epoch_results1 = TL1.run([X, y])
TL1.train_indices = train_indices[10:20]
TL1.valid_indices = valid_indices[10:20]
epoch_results1 = TL1.run([X, y])
TL2 = TrainingLoop(
fit_function,
error,
train_indices[:20],
valid_indices[:20],
minibatch_size,
checkpoint_dict=checkpoint_dict,
list_of_train_output_names=["train_cost"],
valid_output_name="valid_error",
n_epochs=1,
optimizer_object=opt,
)
epoch_results2 = TL2.run([X, y])
r1 = TL1.__dict__["checkpoint_dict"]["previous_results"]["train_cost"][-1]
r2 = TL2.__dict__["checkpoint_dict"]["previous_results"]["train_cost"][-1]
assert r1 == r2
def test_vae():
minibatch_size = 10
random_state = np.random.RandomState(1999)
graph = OrderedDict()
X_sym = add_datasets_to_graph([X], ["X"], graph)
l1_enc = softplus_layer([X_sym],
graph,
'l1_enc',
proj_dim=100,
random_state=random_state)
mu = linear_layer([l1_enc],
graph,
'mu',
proj_dim=50,
random_state=random_state)
log_sigma = linear_layer([l1_enc],
graph,
'log_sigma',
proj_dim=50,
random_state=random_state)
samp = gaussian_log_sample_layer([mu], [log_sigma],
graph,
'gaussian_log_sample',
random_state=random_state)
l1_dec = softplus_layer([samp],
graph,
'l1_dec',
proj_dim=100,
random_state=random_state)
out = sigmoid_layer([l1_dec],
graph,
'out',
proj_dim=X.shape[1],
random_state=random_state)
kl = gaussian_log_kl([mu], [log_sigma], graph, 'gaussian_kl').mean()
cost = binary_crossentropy(out, X_sym).mean() + kl
params, grads = get_params_and_grads(graph, cost)
learning_rate = 0.00000
opt = sgd(params)
updates = opt.updates(params, grads, learning_rate)
fit_function = theano.function([X_sym], [cost],
updates=updates,
mode="FAST_COMPILE")
cost_function = theano.function([X_sym], [cost], mode="FAST_COMPILE")
checkpoint_dict = {}
train_indices = np.arange(len(X))
valid_indices = np.arange(len(X))
early_stopping_trainer(fit_function,
cost_function,
checkpoint_dict, [X],
minibatch_size,
train_indices,
valid_indices,
fit_function_output_names=["cost"],
cost_function_output_name="valid_cost",
n_epochs=1)