def adjust_kp(kp_source,
kp_driving,
kp_driving_initial,
adapt_movement_scale=1,
use_relative_movement=False,
use_relative_jacobian=False):
kp_new = {k: v for k, v in kp_driving.items()}
if use_relative_movement:
kp_value_diff = (kp_driving['value'] - kp_driving_initial['value'])
kp_value_diff *= adapt_movement_scale
kp_new['value'] = kp_value_diff + kp_source['value']
if use_relative_jacobian:
jacobian_diff = F.batch_matmul(
kp_driving['jacobian'],
F.reshape(
F.batch_inv(
F.reshape(kp_driving_initial['jacobian'], (-1, ) +
kp_driving_initial['jacobian'].shape[-2:],
inplace=False)),
kp_driving_initial['jacobian'].shape))
kp_new['jacobian'] = F.batch_matmul(jacobian_diff,
kp_source['jacobian'])
return kp_new
def warp_coordinates(self, coordinates):
theta = self.theta
theta = F.reshape(
theta, theta.shape[:1] + (1,) + theta.shape[1:], inplace=False)
if coordinates.shape[0] == self.bs:
transformed = F.batch_matmul(
F.tile(theta[:, :, :, :2],
(1, coordinates.shape[1], 1, 1)),
F.reshape(coordinates, coordinates.shape + (1,), inplace=False)) + theta[:, :, :, 2:]
else:
transformed = F.batch_matmul(
F.tile(theta[:, :, :, :2],
(1, coordinates.shape[1], 1, 1)),
F.tile(F.reshape(coordinates, coordinates.shape + (1,), inplace=False),
(self.bs / coordinates.shape[0], 1, 1, 1))) + theta[:, :, :, 2:]
transformed = F.reshape(
transformed, transformed.shape[:-1], inplace=False)
if self.tps:
control_points = self.control_points
control_params = self.control_params
distances = F.reshape(
coordinates, (coordinates.shape[0], -1, 1, 2), inplace=False) - F.reshape(control_points, (1, 1, -1, 2))
distances = F.sum(F.abs(distances), axis=distances.ndim - 1)
result = distances ** 2
result = result * F.log(distances + 1e-6)
result = result * control_params
result = F.sum(result, axis=2)
result = F.reshape(
result, (self.bs, coordinates.shape[1], 1), inplace=False)
transformed = transformed + result
return transformed
def attnblock(h, r=8, fix_parameters=False, sn=True, test=False):
"""Attention block"""
x = h
# 1x1 convolutions
b, c, s0, s1 = h.shape
c_r = c // r
assert c_r > 0
f_x = convolution(h, c_r, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="f",
with_bias=False, sn=sn, test=test)
g_x = convolution(h, c_r, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="g",
with_bias=False, sn=sn, test=test)
h_x = convolution(h, c, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="h",
with_bias=False, sn=sn, test=test)
# Attend
attn = F.batch_matmul(f_x.reshape(
[b, c_r, -1]), g_x.reshape([b, c_r, -1]), transpose_a=True)
attn = F.softmax(attn, 1)
h_x = h_x.reshape([b, c, -1])
o = F.batch_matmul(h_x, attn)
o = F.reshape(o, [b, c, s0, s1])
# Shortcut
gamma = get_parameter_or_create(
"gamma", [1, 1, 1, 1], ConstantInitializer(0.), not fix_parameters)
y = gamma * o + x
return y
def attn_block(x, name, num_heads=4, fix_parameters=False):
"""Multihead attention block"""
B, C, H, W = x.shape
with nn.parameter_scope(name):
# Get query, key, value
h = normalize(x, name="norm")
# nin(3 * C) -> split is faster?
q = nin(h, C, name="q")
k = nin(h, C, name="k")
v = nin(h, C, name="v")
# Attention
w = F.batch_matmul(F.reshape(q, (B * num_heads, -1, H * W)),
F.reshape(k, (B * num_heads, -1, H * W)),
transpose_a=True)
w = F.mul_scalar(w, int(C)**(-0.5), inplace=True)
assert w.shape == (B * num_heads, H * W, H * W)
w = F.softmax(w, axis=-1)
h = F.reshape(v, (B * num_heads, -1, H * W))
h = F.batch_matmul(h, w)
h = F.reshape(h, (B, C, H, W))
# output projection
h = nin(h, C, name='proj_out', zeroing_w=True)
assert h.shape == x.shape
return F.add2(h, x, inplace=True)
def _scaled_dot_product_attention(q, k, v, attn_mask, dropout):
B, Nt, E = q.shape
q *= float(E)**-0.5
# (B, Nt, E) x (B, E, Ns) -> (B, Nt, Ns)
attn = F.batch_matmul(q, k, transpose_b=True)
if attn_mask is not None:
attn += attn_mask
attn_output_weights = F.softmax(attn, axis=len(attn.shape) - 1)
if dropout > 0.0:
attn = F.dropout(attn, p=dropout)
# (B, Nt, Ns) x (B, Ns, E) -> (B, Nt, E)
attn_output = F.batch_matmul(attn_output_weights, v)
return attn_output, attn_output_weights
def batch_matmul_backward(inputs, transpose_a=False, transpose_b=False):
"""
Args:
inputs (list of nn.Variable): Incomming grads/inputs to/of the forward function.
kwargs (dict of arguments): Dictionary of the corresponding function arguments.
Return:
list of Variable: Return the gradients wrt inputs of the corresponding function.
"""
dc = inputs[0]
a = inputs[1]
b = inputs[2]
if (transpose_a, transpose_b) == (True, True):
da = F.batch_matmul(b, dc, True, True)
db = F.batch_matmul(dc, a, True, True)
elif (transpose_a, transpose_b) == (True, False):
da = F.batch_matmul(b, dc, False, True)
db = F.batch_matmul(a, dc, False, False)
elif (transpose_a, transpose_b) == (False, True):
da = F.batch_matmul(dc, b, False, False)
db = F.batch_matmul(dc, a, True, False)
elif (transpose_a, transpose_b) == (False, False):
da = F.batch_matmul(dc, b, False, True)
db = F.batch_matmul(a, dc, True, False)
da = _sum(da, a)
db = _sum(db, b)
return da, db
def batch_inv_backward(inputs):
"""
Args:
inputs (list of nn.Variable): Incomming grads/inputs to/of the forward function.
kwargs (dict of arguments): Dictionary of the corresponding function arguments.
Return:
list of Variable: Return the gradients wrt inputs of the corresponding function.
"""
dy = inputs[0]
x0 = inputs[1]
x0_inv = get_output(x0, "BatchInv")
t01 = -F.batch_matmul(x0_inv, dy, True, False)
dx0 = F.batch_matmul(t01, x0_inv, False, True)
return dx0
def compute_context(prev_state):
batch_size = prev_state.shape[0]
ht = PF.affine(prev_state,
attention_units,
with_bias=False,
name='Waht')
# -> (batch_size, attention_units)
ht = F.reshape(ht, (batch_size, 1, attention_units))
# -> (batch_size, 1, attention_units)
ht = F.broadcast(ht,
(batch_size, sentence_length_source, attention_units))
# -> (batch_size, sentence_length_source, attention_units)
attention = F.tanh(hs + ht)
# -> (batch_size, sentence_length_source, attention_units)
attention = time_distributed(PF.affine)(attention,
1,
with_bias=False,
name='attention')
# -> (batch_size, sentence_length_source, 1)
attention = F.softmax(attention, axis=1)
# -> (batch_size, sentence_length_source, 1)
context = F.batch_matmul(hs, attention, transpose_a=True)
context = F.reshape(context, (batch_size, attention_units))
return context
def classification_loss_with_orthogonal_loss(
pred_logit: nn.Variable,
label: nn.Variable,
transformation_mat: nn.Variable,
reg_weight=0.001) -> Tuple[nn.Variable, Dict[str, nn.Variable]]:
"""classification loss with orthogonal loss
Args:
pred_logit (nn.Variable): pred logit, shape(batch, num_classes)
label (nn.Variable): label, shape(batch, 1)
transformation_mat (nn.Variable): label, shape(batch, K, K)
Returns:
Tuple[nn.Variable, Dict[str, nn.Variable]]: loss and internal loss
"""
cross_entropy_loss = F.softmax_cross_entropy(pred_logit, label)
classify_loss = F.mean(cross_entropy_loss)
# Enforce the transformation as orthogonal matrix
mat_squared = F.batch_matmul(transformation_mat,
F.transpose(transformation_mat, (0, 2, 1)))
batch_size, k, _ = transformation_mat.shape
target_array = np.tile(np.eye(k, dtype=np.float32), (batch_size, 1, 1))
target = nn.Variable.from_numpy_array(target_array)
mat_diff = mat_squared - target
# Frobenius norm
mat_diff = F.reshape(mat_diff, (batch_size, -1))
mat_loss = F.mean(F.norm(mat_diff, axis=1))
return classify_loss + mat_loss * reg_weight, {
"classify_loss": classify_loss,
"mat_loss": mat_loss,
"mat_diff": mat_diff,
}
def Bahdanau_attention(query, values, out_features, scope):
r"""Return the Bahdanau attention mechanism.
Args:
query (nn.Variable): A query of size (B, 1, C).
values (nn.Variable): Values of size (B, T, C).
out_features (int): The projected dimensionality.
scope (str): Parameter scope.
Returns:
nn.Variable: The context vector.
nn.Variable: The attention weight vector.
"""
with nn.parameter_scope(scope):
x = PF.affine(query, out_features, base_axis=2,
with_bias=False, name='query')
y = PF.affine(values, out_features, base_axis=2,
with_bias=False, name='values')
# scores of shape (B, T, 1)
scores = PF.affine(F.tanh(x + y), 1, base_axis=2,
with_bias=False, name='scores')
# attention_weights of shape (B, 1, T)
attention_weights = F.softmax(
scores, axis=1).reshape((query.shape[0], 1, -1))
# context_vector shape after sum == (B, 1, C)
context_vector = F.batch_matmul(attention_weights, values)
return context_vector, attention_weights
def dyn_2d_filter(x, lf_2d, k_sz):
"""
Dynamic 2d filtering
"""
with nn.parameter_scope('Dynamic_2D_Filtering'):
f_localexpand = nn.Variable.from_numpy_array(
np.eye(k_sz[0] * k_sz[1], k_sz[0] * k_sz[1]))
f_localexpand = F.reshape(
f_localexpand,
(k_sz[0], k_sz[1], 1, k_sz[0] * k_sz[1])) # (9,9,1,81))
f_localexpand = F.transpose(f_localexpand, (3, 0, 1, 2)) # (81,9,9,1))
x_sz = x.shape
x = F.reshape(x, (x_sz[0], x_sz[1], x_sz[2], 1)) # (1,100,170,1)
x_localexpand = F.convolution(x,
f_localexpand,
stride=(1, 1),
pad=(4, 4),
channel_last=True) # (1,100,170,81)
x_le_sz = x_localexpand.shape
x_localexpand = F.reshape(
x_localexpand, (x_le_sz[0], x_le_sz[1], x_le_sz[2], 1, x_le_sz[3]))
y = F.batch_matmul(x_localexpand, lf_2d)
y_sz = y.shape
y = F.reshape(y, (y_sz[0], y_sz[1], y_sz[2], y_sz[4]))
return y
def sample_noise(inpt_size, out_size):
_f = lambda x: F.sign(x) * F.pow_scalar(F.abs(x), 0.5)
noise = _f(F.randn(shape=(inpt_size + out_size, )))
eps_w = F.batch_matmul(F.reshape(noise[:inpt_size], (1, -1)),
F.reshape(noise[inpt_size:], (1, -1)), True)
eps_b = noise[inpt_size:]
return eps_w, eps_b
def logits(image, text):
image_features = encode_image(image)
text_features = encode_text(text)
# normalized features
image_features = image_features / \
F.norm(image_features, axis=1, keepdims=True)
text_features = text_features / \
F.norm(text_features, axis=1, keepdims=True)
# cosine similarity as logits
logit_scale = nn.parameter.get_parameter_or_create(name='logit_scale',
shape=())
logit_scale = F.exp(logit_scale)
image_features = image_features.reshape(
(1, image_features.shape[0], image_features.shape[1]))
text_features = F.transpose(text_features, (1, 0))
text_features = text_features.reshape(
(1, text_features.shape[0], text_features.shape[1]))
per_image = F.batch_matmul(image_features, text_features).reshape(
(image_features.shape[0], -1))
logits_per_image = logit_scale.reshape((1, 1)) * per_image
logits_per_text = F.transpose(logits_per_image, (1, 0))
# shape = [global_batch_size, global_batch_size]
return logits_per_image, logits_per_text
def transform(point, center, scale, resolution, invert=False):
"""Generate and affine transformation matrix.
Given a set of points, a center, a scale and a targer resolution, the
function generates and affine transformation matrix. If invert is ``True``
it will produce the inverse transformation.
Arguments:
point {numpy.array} -- the input 2D point
center {numpy.array} -- the center around which to perform the transformations
scale {float} -- the scale of the face/object
resolution {float} -- the output resolution
Keyword Arguments:
invert {bool} -- define wherever the function should produce the direct or the
inverse transformation matrix (default: {False})
"""
point.append(1)
h = 200.0 * scale
t = F.matrix_diag(F.constant(1, [3]))
t.d[0, 0] = resolution / h
t.d[1, 1] = resolution / h
t.d[0, 2] = resolution * (-center[0] / h + 0.5)
t.d[1, 2] = resolution * (-center[1] / h + 0.5)
if invert:
t = F.reshape(F.batch_inv(F.reshape(t, [1, 3, 3])), [3, 3])
_pt = nn.Variable.from_numpy_array(point)
new_point = F.reshape(F.batch_matmul(
F.reshape(t, [1, 3, 3]), F.reshape(_pt, [1, 3, 1])), [3, ])[0:2]
return new_point.d.astype(int)
def vision_transformer(x, input_res, patch_size, v_width, v_layers, v_heads,
embed_dim):
scale = v_width**-0.5
with nn.parameter_scope("visual"):
con1_w = nn.parameter.get_parameter_or_create(name="conv1/W",
shape=(v_width, 3,
patch_size,
patch_size))
x = F.convolution(
x, con1_w, bias=None,
stride=(patch_size, patch_size)) # shape = [*, width, grid, grid]
# shape = [*, width, grid ** 2]
x = F.reshape(x, (x.shape[0], x.shape[1], -1))
x = F.transpose(x, (0, 2, 1)) # shape = [*, grid ** 2, width]
z = np.zeros((x.shape[0], 1, x.shape[-1]))
zeros = nn.Variable.from_numpy_array(z)
class_embed = nn.parameter.get_parameter_or_create(
name="class_embedding", shape=(v_width, )).reshape(
(x.shape[0], 1, v_width))
# shape = [*, grid ** 2 + 1, width]
x = F.concatenate(class_embed + zeros, x, axis=1)
positional_embedding = nn.parameter.get_parameter_or_create(
name='positional_embedding',
shape=((input_res // patch_size)**2 + 1, v_width)).reshape(
(x.shape[0], x.shape[1], v_width))
x = x + positional_embedding
ln_pre_w = nn.parameter.get_parameter_or_create(
name="ln_pre/W", shape=(v_width, )).reshape((1, 1, v_width))
ln_pre_b = nn.parameter.get_parameter_or_create(
name="ln_pre/b", shape=(v_width, )).reshape((1, 1, v_width))
x = F.layer_normalization(x, ln_pre_b, ln_pre_w, batch_axis=(0, 1))
x = F.transpose(x, (1, 0, 2)) # NLD -> LND
x = transformer(x, v_width, v_layers, v_heads)
x = F.transpose(x, (1, 0, 2)) # LND -> NLD
ln_post_w = nn.parameter.get_parameter_or_create(
name="ln_post/W", shape=(v_width, )).reshape((1, 1, v_width))
ln_post_b = nn.parameter.get_parameter_or_create(
name="ln_post/b", shape=(v_width, )).reshape((1, 1, v_width))
x = F.slice(x, stop=(x.shape[0], 1, x.shape[2]))
x = F.layer_normalization(x, ln_post_b, ln_post_w)
if 'proj' in nn.get_parameters():
visual_proj = nn.parameter.get_parameter_or_create(
name="proj", shape=(v_width, embed_dim)).reshape(
(1, v_width, -1))
x = F.batch_matmul(x, visual_proj)
x = x.reshape((-1, embed_dim))
return x
def build_self_attention_model(train=True):
x = nn.Variable((batch_size, max_len))
t = nn.Variable((batch_size, 1))
mask = get_mask(x)
attention_mask = (F.constant(1, shape=mask.shape) - mask) * F.constant(
np.finfo(np.float32).min, shape=mask.shape)
with nn.parameter_scope('embedding'):
h = time_distributed(PF.embed)(x, vocab_size, embedding_size) * mask
with nn.parameter_scope('forward'):
h_f = lstm(h,
hidden_size,
mask=mask,
return_sequences=True,
return_state=False)
with nn.parameter_scope('backward'):
h_b = lstm(h[:, ::-1, ],
hidden_size,
mask=mask,
return_sequences=True,
return_state=False)[:, ::-1, ]
h = F.concatenate(h_f, h_b, axis=2)
if train:
h = F.dropout(h, p=dropout_ratio)
with nn.parameter_scope('da'):
a = F.tanh(time_distributed(PF.affine)(h, da))
if train:
a = F.dropout(a, p=dropout_ratio)
with nn.parameter_scope('r'):
a = time_distributed(PF.affine)(a, r)
if train:
a = F.dropout(a, p=dropout_ratio)
a = F.softmax(a + attention_mask, axis=1)
m = F.batch_matmul(a, h, transpose_a=True)
with nn.parameter_scope('output_mlp'):
output = F.relu(PF.affine(m, output_mlp_size))
if train:
output = F.dropout(output, p=dropout_ratio)
with nn.parameter_scope('output'):
y = F.sigmoid(PF.affine(output, 1))
accuracy = F.mean(F.equal(F.round(y), t))
loss = F.mean(F.binary_cross_entropy(
y, t)) + attention_penalty_coef * frobenius(
F.batch_matmul(a, a, transpose_a=True) - batch_eye(batch_size, r))
return x, t, accuracy, loss
def _spectral_norm_outer_most_dim_backward(dw_sn, w, u, itr=1, eps=1e-12):
# Forward recomputation
w_shape = w.shape
d0 = np.prod(w.shape[0:-1]) # In
d1 = w.shape[-1] # Out
w = F.reshape(w, [d0, d1])
u = F.reshape(u, [d1, 1])
# Power method
for _ in range(itr):
# v
v = F.affine(w, u)
v = v / ((F.sum(v ** 2.0, keepdims=True) + eps) ** 0.5)
v = F.reshape(v, [1, d0])
# u
u = F.affine(v, w)
u = u / ((F.sum(u ** 2.0, keepdims=True) + eps) ** 0.5)
u = F.reshape(u, [d1, 1])
# No grad
u = no_grad(u)
v = no_grad(v)
# Spectral normalization
vw = F.affine(v, w)
sigma = F.affine(vw, u)
w_sn = w / sigma
# The fowllowing process is not necessary for gradient calculation
# w_sn = F.reshape(w_sn, w_shape)
# Backward for spectral norm
dw_sn = dw_sn.reshape(w.shape)
# Sum for broadcast backward
S = sum_for_arithmetics(dw_sn * w_sn, sigma)
# Add batch axis
S = S.reshape((1,) + S.shape)
u = u.reshape((1,) + u.shape)
v = v.reshape((1,) + v.shape)
m = F.batch_matmul(v, S, transpose_a=True)
m = F.batch_matmul(m, u, transpose_b=True)
# Remove batch axis
m = m.reshape((m.shape[1], m.shape[2]))
dw = (dw_sn - m) / sigma
dw = dw.reshape(w_shape)
return dw, None
def attention(query,
key,
value,
mask: Optional[nn.Variable] = None,
train: bool = True,
dropout_ratio: float = 0.1,
fix_parameters=False):
'''
A global attention layer
Args:
inputs (nnabla.Variable): A shape of [B, sen_len_query, units]
memory (nnabla.Variable): A shape of [B, sen_len_memory, units]
mask (nnabla.Variable): A shape of [B, sen_len_query, sen_len_memory]
fix_parameters (bool): Fix parameters (Set need_grad=False).
Returns:
nn.Variable: A shape [B, units].
'''
batch_size, sentence_length_query, embedding_size = query.shape
batch_size, sentence_length_memory, embedding_size = key.shape
q = query
# -> (batch_size, sentence_length_query, embedding_size)
k = key
# -> (batch_size, sentence_length_memory, embedding_size)
v = value
# -> (batch_size, sentence_length_memory, embedding_size)
logit = F.batch_matmul(q, k, transpose_b=True) * (embedding_size**-0.5)
# -> (batch_size, sentence_length_query, sentence_length_memory)
# maskのshapeは-> (batch_size, sentence_length_query, sentence_length_memory)である
if mask is not None:
logit += get_attention_logit_mask(mask)
attention_weights = F.softmax(logit, axis=2)
# -> (batch_size, sentence_length_query, sentence_length_memory)
if train:
attention_weights = F.dropout(attention_weights, p=dropout_ratio)
attention_output = F.batch_matmul(attention_weights, v)
# -> (batch_size, sentence_length_query, embedding_size)
return attention_output
def equivariance_jacobian_loss(kp_driving_jacobian, arithmetic_jacobian,
trans_kp_jacobian, weight):
jacobian_transformed = F.batch_matmul(arithmetic_jacobian,
trans_kp_jacobian)
normed_driving = F.reshape(
F.batch_inv(
F.reshape(kp_driving_jacobian,
(-1, ) + kp_driving_jacobian.shape[-2:])),
kp_driving_jacobian.shape)
normed_transformed = jacobian_transformed
value = F.batch_matmul(normed_driving, normed_transformed)
eye = nn.Variable.from_numpy_array(np.reshape(np.eye(2), (1, 1, 2, 2)))
jacobian_loss = F.mean(F.absolute_error(eye, value))
loss = weight * jacobian_loss
return loss
def compute_mel(self, wave):
hp = self.hparams
reals, imags = F.stft(wave,
window_size=hp.win_length,
stride=hp.hop_length,
fft_size=hp.n_fft)
linear = F.pow_scalar(
F.add2(F.pow_scalar(reals, 2), F.pow_scalar(imags, 2)), 0.5)
mels = F.batch_matmul(self.basis, linear)
mels = F.log(F.clip_by_value(mels, 1e-5,
np.inf)).apply(need_grad=False)
return mels
def create_sparse_motions(source_image, kp_driving, kp_source, num_kp):
bs, _, h, w = source_image.shape
identity_grid = make_coordinate_grid((h, w))
identity_grid = F.reshape(identity_grid,
(1, 1, h, w, 2)) # (1, 1, h, w, 2)
coordinate_grid = identity_grid - \
F.reshape(kp_driving['value'], (bs, num_kp, 1, 1, 2), inplace=False)
if 'jacobian' in kp_driving:
jacobian = F.batch_matmul(
kp_source['jacobian'],
F.reshape(
F.batch_inv(
F.reshape(kp_driving['jacobian'],
(-1, ) + kp_driving['jacobian'].shape[-2:],
inplace=False)), kp_driving['jacobian'].shape))
# what it does
# batched_driving_jacobian = F.reshape(kp_driving['jacobian'], (-1) + kp_driving['jacobian'].shape[-2:])
# batched_inverse_jacobian = F.batch_inv(batched_driving_jacobian)
# inverse_jacobian = F.reshape(batched_inverse_jacobian, kp_driving['jacobian'].shape)
jacobian = F.reshape(
jacobian, jacobian.shape[:-2] + (1, 1) + jacobian.shape[-2:])
jacobian = F.broadcast(
jacobian, jacobian.shape[:2] + (h, w) + jacobian.shape[-2:])
coordinate_grid = F.batch_matmul(
jacobian, F.reshape(coordinate_grid,
coordinate_grid.shape + (1, )))
coordinate_grid = F.reshape(coordinate_grid,
coordinate_grid.shape[:-1])
driving_to_source = coordinate_grid + \
F.reshape(kp_source['value'], (bs, num_kp, 1, 1, 2), inplace=False)
# background feature
identity_grid = F.broadcast(identity_grid, (bs, 1, h, w, 2))
sparse_motions = F.concatenate(identity_grid, driving_to_source, axis=1)
return sparse_motions
def encode_text(text):
param_dict = nn.get_parameters()
embed_dim = param_dict['text_projection'].shape[1]
context_length = param_dict['positional_embedding'].shape[0]
vocab_size = param_dict['token_embedding/W'].shape[0]
transformer_width = param_dict['ln_final/W'].shape[0]
transformer_heads = transformer_width // 64
transformer_layers = len(
set(
k.split('/')[2] for k in param_dict.keys()
if k.startswith(f'transformer/resblocks')))
token_embedding = nn.parameter.get_parameter_or_create(
name='token_embedding/W', shape=(vocab_size, transformer_width))
x = F.embed(text, token_embedding) # [batch_size, n_ctx, d_model]
positional_embedding = nn.parameter.get_parameter_or_create(
name='positional_embedding',
shape=(context_length, transformer_width)).reshape(
(1, context_length, transformer_width))
x = x + positional_embedding
x = F.transpose(x, (1, 0, 2)) # NLD -> LND
x = transformer(x,
transformer_width,
transformer_layers,
transformer_heads,
attn_mask=build_attn_mask(context_length))
x = F.transpose(x, (1, 0, 2)) # LND -> NLD
ln_final_W = nn.parameter.get_parameter_or_create(
name='ln_final/W', shape=(transformer_width, )).reshape(
(1, 1, transformer_width))
ln_final_b = nn.parameter.get_parameter_or_create(
name='ln_final/b', shape=(transformer_width, )).reshape(
(1, 1, transformer_width))
x = F.layer_normalization(x, ln_final_b, ln_final_W, batch_axis=(0, 1))
idx = F.max(text, axis=-1, only_index=True)
idx.forward()
x = x[list(range(x.shape[0])), idx.d].reshape((1, x.shape[0], -1))
text_projection = nn.parameter.get_parameter_or_create(
name='text_projection', shape=(transformer_width, embed_dim)).reshape(
(1, transformer_width, embed_dim))
x = F.batch_matmul(x, text_projection)
x = x.reshape((-1, embed_dim))
return x
def unit_sphere_intersection(self, camloc, raydir):
BR, _ = raydir.shape
a = 1.0 # raydir is already normalized
b = 2.0 * F.batch_matmul(F.reshape(camloc, (BR, 1, 3)),
F.reshape(raydir, (BR, 3, 1)))
c = F.batch_matmul(F.reshape(camloc, (BR, 1, 3)),
F.reshape(camloc, (BR, 3, 1))) - 1.0
D = b**2 - 4 * a * c
mask = F.reshape(F.greater_scalar(D, 0.0), (BR, 1))
b = F.reshape(b, (BR, 1))
D = F.reshape(D, (BR, 1))
D = mask * D
D_sqrt = D**0.5
t_start = -(b + D_sqrt) / (2 * a)
t_finish = -(b - D_sqrt) / (2 * a)
t_start = t_start * mask + self.t_near * (1 - mask)
t_finish = t_finish * mask + self.t_far * (1 - mask)
return t_start, t_finish, mask
def compute_mel(wave, basis, hp):
r"""Compute the mel-spectrogram from the waveform.
Args:
wave (nn.Variable): Wavefrom variable of shape (B, 1, L).
basis (nn.Variable): Basis for mel-spectrogram computation.
hp (HParams): Hyper-parameters.
Returns:
nn.Variable: Output variable.
"""
reals, imags = stft(wave,
window_size=hp.win_length,
stride=hp.hop_length,
fft_size=hp.n_fft)
linear = (reals**2 + imags**2)**0.5
mels = F.batch_matmul(basis, linear)
mels = F.log(F.clip_by_value(mels, 1e-5, np.inf))
return mels
def sample_network(x_curr, sdf_cur, raydir, grad_curr):
"""
x_curr: Points (B, R, 3) either on surface or not
sdf_cur: SDF on x_curr (B, R, 1)
raydir: Ray direction (B, R, 3)
grad_curr: Gradients on x_curr (B, R, 3)
"""
# Denominator
de = F.batch_matmul(grad_curr[..., np.newaxis, :],
raydir[..., np.newaxis, :],
transpose_b=True)
de = de.reshape(sdf_cur.shape)
de_inv = (1.0 / de).apply(need_grad=False)
de_inv = F.minimum_scalar(de_inv, 1e30).apply(
need_grad=False) # (numerical issue de = cos(x, y) = 0)
# Differentiable intersection point (discrete update of implicit differentiation)
sdf_cur0 = sdf_cur.get_unlinked_variable(need_grad=False)
x_hat = x_curr - (sdf_cur - sdf_cur0) * de_inv * raydir
return x_hat
def log_mel_spectrogram(wave, sr, window_size, n_mels=80):
"""Return log mel-spectrogram.
Args:
wave (nn.Variable): Input waveform of shape (B, 1, L).
sr (int): Sampling rate.
window_size (int): Window size.
n_mels (int): Number of mel banks.
jitter (bool): Whether to apply random crop. Defaults to False.
max_jitter_steps (int): Maximum number of jitter steps if jitter is
set to `True`.
Returns:
nn.Variable: Log mel-spectrogram.
"""
linear = spectrogram(wave, window_size)
mel_basis = librosa_mel_fn(sr,
window_size,
n_mels=n_mels,
fmin=80.0,
fmax=7600.0)
basis = nn.Variable.from_numpy_array(mel_basis[None, ...])
mels = F.batch_matmul(basis, linear)
return F.log(mels * 1e4 + 1.0)
def backward_impl(self, inputs, outputs, prop_down, accum):
# inputs: [inputs_fwd_graph] + [inputs_bwd_graph] or
# [inputs_fwd_graph] + [outputs_fwd_graph] + [inputs_bwd_graph]
shape_a = inputs[0].shape
shape_b = inputs[1].shape
if shape_a[:-2] != shape_b[:-2]:
raise ValueError("shape_a[:-2] () != shape_b[:-2] (). \n"
"Implicit broadcast is supported now.",
shape_a[:-2] != shape_b[:-2])
# Args
transpose_a = self.forward_func.info.args["transpose_a"]
transpose_b = self.forward_func.info.args["transpose_b"]
# Inputs
x0 = inputs[0].data
x1 = inputs[1].data
dy = inputs[2].data
# Outputs
dx0 = outputs[0].data
dx1 = outputs[1].data
# Grads of inputs
g_x0 = inputs[0].grad
g_x1 = inputs[1].grad
g_dy = inputs[2].grad
# Grads of outputs
g_dx0 = outputs[0].grad
g_dx1 = outputs[1].grad
# Computation
if prop_down[0]:
# condition
if (transpose_a, transpose_b) == (True, True):
g_x0_ = F.batch_matmul(g_dx1, dy, True, True)
if (transpose_a, transpose_b) == (True, False):
g_x0_ = F.batch_matmul(g_dx1, dy, False, True)
if (transpose_a, transpose_b) == (False, True):
g_x0_ = F.batch_matmul(dy, g_dx1, False, False)
if (transpose_a, transpose_b) == (False, False):
g_x0_ = F.batch_matmul(dy, g_dx1, False, True)
# reshape for batch axes
if g_x0_.shape != g_x0.shape:
g_x0_ = F.reshape(g_x0_, g_x0.shape)
if accum[0]:
g_x0 += g_x0_
else:
g_x0.copy_from(g_x0_)
if prop_down[1]:
# condition
if (transpose_a, transpose_b) == (True, True):
g_x1_ = F.batch_matmul(dy, g_dx0, True, True)
if (transpose_a, transpose_b) == (True, False):
g_x1_ = F.batch_matmul(g_dx0, dy, False, False)
if (transpose_a, transpose_b) == (False, True):
g_x1_ = F.batch_matmul(dy, g_dx0, True, False)
if (transpose_a, transpose_b) == (False, False):
g_x1_ = F.batch_matmul(g_dx0, dy, True, False)
# reshape for batch axes
if g_x1_.shape != g_x1.shape:
g_x1_ = F.reshape(g_x1_, g_x1.shape)
if accum[1]:
g_x1 += g_x1_
else:
g_x1.copy_from(g_x1_)
if prop_down[2]:
t1 = F.batch_matmul(g_dx0, x1, transpose_a, transpose_b)
t2 = F.batch_matmul(x0, g_dx1, transpose_a, transpose_b)
g_dy_ = t1 + t2
if accum[2]:
g_dy += g_dy_
else:
g_dy.copy_from(g_dy_)
with_file_cache=False)
x = nn.Variable([batch_size, window_size * 2])
with nn.parameter_scope('W_in'):
h = PF.embed(x, vocab_size, embedding_size)
h = F.mean(h, axis=1)
h = expand_dims(h, axis=-1) # (batch_size, embedding_size, 1)
t = nn.Variable([batch_size, 1])
t_neg = nn.Variable([batch_size, k])
with nn.parameter_scope('W_out'):
_t = PF.embed(t, vocab_size,
embedding_size) # (batch_size, 1, embedding_size)
_t_neg = PF.embed(t_neg, vocab_size,
embedding_size) # (batch_size, k, embedding_size)
t_score = F.sigmoid(F.reshape(F.batch_matmul(_t, h), shape=(batch_size, 1)))
t_neg_score = F.sigmoid(
F.reshape(F.batch_matmul(_t_neg, h), shape=(batch_size, k)))
t_loss = F.binary_cross_entropy(t_score, F.constant(1, shape=(batch_size, 1)))
t_neg_loss = F.binary_cross_entropy(t_neg_score,
F.constant(0, shape=(batch_size, k)))
loss = F.mean(F.sum(t_loss, axis=1) + F.sum(t_neg_loss, axis=1))
# Create solver.
solver = S.Adam()
solver.set_parameters(nn.get_parameters())
trainer = Trainer(inputs=[x, t, t_neg], loss=loss, solver=solver)
trainer.run(train_data_iter, valid_data_iter, epochs=max_epoch)
def cond_att_lstm(x,
parent_index,
mask,
context,
context_mask,
state_size,
att_hidden_size,
initial_state=None,
initial_cell=None,
hist=None,
dropout=0,
train=True,
w_init=None,
inner_w_init=None,
b_init=I.ConstantInitializer(0),
forget_bias_init=I.ConstantInitializer(1)):
"""
x: (batch_size, length, input_size)
parent_index: (batch_size, length)
mask: (batch_size, length)
context: (batch_size, context_length, context_size)
context_mask: (batch_size, context_length)
hist: (batch_size, l, state_size)
"""
batch_size, length, input_size = x.shape
_, context_length, context_size = context.shape
if w_init is None:
w_init = I.UniformInitializer(
I.calc_uniform_lim_glorot(input_size, state_size))
if inner_w_init is None:
inner_w_init = orthogonal
retain_prob = 1.0 - dropout
z_w = nn.Variable((batch_size, 4, input_size), need_grad=False)
z_w.d = 1
z_u = nn.Variable((batch_size, 4, state_size), need_grad=False)
z_u.d = 1
if dropout > 0:
if train:
z_w = F.dropout(z_w, p=retain_prob)
z_u = F.dropout(z_u, p=retain_prob)
z_w *= retain_prob
z_u *= retain_prob
z_w = F.reshape(z_w, (batch_size, 4, 1, input_size))
z_w = F.broadcast(z_w, (batch_size, 4, length, input_size))
z_w = F.split(z_w, axis=1)
z_u = F.split(z_u, axis=1)
xi = z_w[0] * x
xf = z_w[1] * x
xc = z_w[2] * x
xo = z_w[3] * x
with nn.parameter_scope("cond_att_lstm"):
# (batch_size, length, state_size)
with nn.parameter_scope("lstm"):
xi = PF.affine(
xi,
state_size,
base_axis=2,
w_init=w_init,
b_init=b_init,
name="Wi")
xf = PF.affine(
xf,
state_size,
base_axis=2,
w_init=w_init,
b_init=forget_bias_init,
name="Wf")
xc = PF.affine(
xc,
state_size,
base_axis=2,
w_init=w_init,
b_init=b_init,
name="Wc")
xo = PF.affine(
xo,
state_size,
base_axis=2,
w_init=w_init,
b_init=b_init,
name="Wo")
with nn.parameter_scope("context"):
# context_att_trans: (batch_size, context_size, att_hidden_size)
context_att_trans = PF.affine(
context,
att_hidden_size,
base_axis=2,
w_init=w_init,
b_init=b_init,
name="layer1_c")
if initial_state is None:
h = nn.Variable((batch_size, state_size), need_grad=False)
h.data.zero()
else:
h = initial_state
if initial_cell is None:
c = nn.Variable((batch_size, state_size), need_grad=False)
c.data.zero()
else:
c = initial_cell
if hist is None:
hist = nn.Variable((batch_size, 1, state_size), need_grad=False)
hist.data.zero()
# (batch_size, state_size)
xi = split(xi, axis=1)
xf = split(xf, axis=1)
xc = split(xc, axis=1)
xo = split(xo, axis=1)
mask = F.reshape(mask, [batch_size, length, 1]) # (batch_size, length, 1)
mask = F.broadcast(mask, [batch_size, length, state_size])
# (batch_size, state_size)
mask = split(mask, axis=1)
# (batch_size, max_action_length)
parent_index = parent_index + 1 # index == 0 means that parent is root
# (batch_size)
parent_index = split(parent_index, axis=1)
hs = []
cs = []
ctx = []
for i, f, c2, o, m, p in zip(xi, xf, xc, xo, mask, parent_index):
h_num = hist.shape[1]
with nn.parameter_scope("context"):
h_att_trans = PF.affine(
h,
att_hidden_size,
with_bias=False,
w_init=w_init,
name="layer1_h") # (batch_size, att_hidden_size)
h_att_trans = F.reshape(h_att_trans,
(batch_size, 1, att_hidden_size))
h_att_trans = F.broadcast(
h_att_trans, (batch_size, context_length, att_hidden_size))
att_hidden = F.tanh(context_att_trans + h_att_trans)
att_raw = PF.affine(
att_hidden, 1, base_axis=2, w_init=w_init,
b_init=b_init) # (batch_size, context_length, 1)
att_raw = F.reshape(att_raw, (batch_size, context_length))
ctx_att = F.exp(att_raw - F.max(att_raw, axis=1, keepdims=True))
ctx_att = ctx_att * context_mask
ctx_att = ctx_att / F.sum(ctx_att, axis=1, keepdims=True)
ctx_att = F.reshape(ctx_att, (batch_size, context_length, 1))
ctx_att = F.broadcast(ctx_att,
(batch_size, context_length, context_size))
ctx_vec = F.sum(
context * ctx_att, axis=1) # (batch_size, context_size)
# parent_history
p = F.reshape(p, (batch_size, 1))
p = F.one_hot(p, (h_num, ))
p = F.reshape(p, (batch_size, 1, h_num))
par_h = F.batch_matmul(p, hist) # [batch_size, 1, state_size]
par_h = F.reshape(par_h, (batch_size, state_size))
with nn.parameter_scope("lstm"):
i_t = PF.affine(
z_u[0] * h,
state_size,
w_init=inner_w_init(state_size, state_size),
with_bias=False,
name="Ui")
i_t += PF.affine(
ctx_vec,
state_size,
w_init=inner_w_init(context_size, state_size),
with_bias=False,
name="Ci")
i_t += PF.affine(
par_h,
state_size,
w_init=inner_w_init(state_size, state_size),
with_bias=False,
name="Pi")
i_t = F.sigmoid(i + i_t)
f_t = PF.affine(
z_u[1] * h,
state_size,
w_init=inner_w_init(state_size, state_size),
with_bias=False,
name="Uf")
f_t += PF.affine(
ctx_vec,
state_size,
w_init=inner_w_init(context_size, state_size),
with_bias=False,
name="Cf")
f_t += PF.affine(
par_h,
state_size,
w_init=inner_w_init(state_size, state_size),
with_bias=False,
name="Pf")
f_t = F.sigmoid(f + f_t)
c_t = PF.affine(
z_u[2] * h,
state_size,
w_init=inner_w_init(state_size, state_size),
with_bias=False,
name="Uc")
c_t += PF.affine(
ctx_vec,
state_size,
w_init=inner_w_init(context_size, state_size),
with_bias=False,
name="Cc")
c_t += PF.affine(
par_h,
state_size,
w_init=inner_w_init(state_size, state_size),
with_bias=False,
name="Pc")
c_t = f_t * c + i_t * F.tanh(c2 + c_t)
o_t = PF.affine(
z_u[3] * h,
state_size,
w_init=inner_w_init(state_size, state_size),
with_bias=False,
name="Uo")
o_t += PF.affine(
ctx_vec,
state_size,
w_init=inner_w_init(context_size, state_size),
with_bias=False,
name="Co")
o_t += PF.affine(
par_h,
state_size,
w_init=inner_w_init(state_size, state_size),
with_bias=False,
name="Po")
o_t = F.sigmoid(o + o_t)
h_t = o_t * F.tanh(c_t)
h_t = (1 - m) * h + m * h_t
c_t = (1 - m) * c + m * c_t
h = h_t
c = c_t
h_t = F.reshape(h_t, (batch_size, 1, state_size), inplace=False)
c_t = F.reshape(c_t, (batch_size, 1, state_size), inplace=False)
ctx_vec = F.reshape(
ctx_vec, (batch_size, 1, context_size), inplace=False)
hs.append(h_t)
cs.append(c_t)
ctx.append(ctx_vec)
hist = F.concatenate(
hist, h_t, axis=1) # (batch_size, h_num + 1, state_size)
return concatenate(
*hs, axis=1), concatenate(
*cs, axis=1), concatenate(
*ctx, axis=1), hist
def _spectral_norm_backward(dw_sn, w, u, dim=0, itr=1, eps=1e-12):
# Forward recomputation
w_shape = w.shape
# Transpose if the output dimension is not the most-left dimension.
if dim != 0:
dims_transpose = [dim] + [i for i in range(len(w_shape)) if i != dim]
w = F.transpose(w, dims_transpose)
w_shape = w.shape
d0 = w.shape[0] # Out
d1 = np.prod(w.shape[1:]) # In
w = F.reshape(w, [d0, d1])
u = F.reshape(u, [1, d0])
# Power method
for _ in range(itr):
# v
v = F.affine(u, w)
v = v / ((F.sum(v ** 2.0, keepdims=True) + eps) ** 0.5)
v = F.reshape(v, [d1, 1])
# u
u = F.affine(w, v)
u = u / ((F.sum(u ** 2.0, keepdims=True) + eps) ** 0.5)
u = F.reshape(u, [1, d0])
# No grad
u = no_grad(u)
v = no_grad(v)
# Spectral normalization
wv = F.affine(w, v)
sigma = F.affine(u, wv)
w_sn = w / sigma
# The fowllowing process is not necessary for gradient calculation
# w_sn = F.reshape(w_sn, w_shape)
# # Transpose again if the output dimension is not the most-left dimension.
# if dim != 0:
# dims_transpose = [i for i in range(1, dim + 1)] \
# + [0] + [i for i in range(dim + 1, len(w_shape))]
# w_sn = F.transpose(w_sn, dims_transpose)
# Backward
# Backward for post-transpose
if dim != 0:
dims_transpose = [dim] + [i for i in range(len(w_shape)) if i != dim]
dw_sn = F.transpose(dw_sn, dims_transpose)
dw_sn = dw_sn.reshape(w.shape)
# Backward for spectral norm
# Sum for broadcast backward
S = sum_for_arithmetics(dw_sn * w_sn, sigma)
# Add batch axis
S = S.reshape((1,) + S.shape)
u = u.reshape((1,) + u.shape)
v = v.reshape((1,) + v.shape)
m = F.batch_matmul(u, S, transpose_a=True)
m = F.batch_matmul(m, v, transpose_b=True)
# Remove batch axis
m = m.reshape((m.shape[1], m.shape[2]))
dw = (dw_sn - m) / sigma
# Backward for pre-transpose
dw = dw.reshape(w_shape)
if dim != 0:
dims_transpose = [i for i in range(1, dim + 1)] \
+ [0] + [i for i in range(dim + 1, len(w_shape))]
dw = F.transpose(dw, dims_transpose)
return dw, None
