class ArcFace(nn.Module):
def __init__(self, in_features, out_features, s=30.0, m=0.50, bias=False):
super(ArcFace, self).__init__()
self.in_features = in_features
self.out_features = out_features
self.s = s
self.m = m
self.cos_m = math.cos(m)
self.sin_m = math.sin(m)
self.th = math.cos(math.pi - m)
self.mm = math.sin(math.pi - m) * m
self.weight = Parameter(torch.Tensor(out_features, in_features))
if bias:
self.bias = Parameter(torch.Tensor(out_features))
else:
self.register_parameter('bias', None)
self.reset_parameters()
def reset_parameters(self):
nn.init.kaiming_uniform_(self.weight, a=math.sqrt(5))
if self.bias is not None:
fan_in, _ = nn.init._calculate_fan_in_and_fan_out(self.weight)
bound = 1 / math.sqrt(fan_in)
nn.init.uniform_(self.bias, -bound, bound)
def forward(self, input, label):
cosine = F.linear(F.normalize(input), F.normalize(self.weight.half()))
sine = torch.sqrt((1.0 - torch.pow(cosine, 2)).clamp(0, 1)).half()
phi = cosine * self.cos_m - sine * self.sin_m
phi = torch.where(cosine > self.th, phi, cosine - self.mm)
# --------------------------- convert label to one-hot ---------------------------
# one_hot = torch.zeros(cosine.size(), requires_grad=True, device='cuda')
one_hot = torch.zeros(cosine.size(), device='cuda')
one_hot.scatter_(1, label.view(-1, 1).long(), 1)
# -------------torch.where(out_i = {x_i if condition_i else y_i) -------------
output = (one_hot * phi) + (
(1.0 - one_hot) * cosine) # you can use torch.where if your torch.__version__ is 0.4
output *= self.s
# print(output)
return output
class PositionWiseFeedForward(nn.Module):
"""Two-layer Feed-forward neural network"""
def __init__(self,
model_size,
inner_size,
dropout=0.,
variational=False,
activation='relu',
glu=False,
weight_drop=0.0,
dropout_residual=False,
res_dropout=0.0):
super().__init__()
self.model_size = model_size
self.inner_size = inner_size
self.dropout = dropout
self.bias = True
self.variational = variational
self.activation = activation
self.glu = glu
self.weight_drop = weight_drop
self.autograd = False
self.fused_dropout_add = False
self.dropout_residual = dropout_residual
self.res_dropout = res_dropout
if self.activation == 'relu':
if self.glu:
self.act = nn.ReLU(inplace=True)
else:
self.act = ReLUDropout(p=self.dropout,
variational=self.variational,
batch_first=False)
elif self.activation == 'gelu':
self.act = nn.GELU()
elif self.activation == 'agelu':
self.act = AGELU()
elif self.activation in ['silu', 'swish']:
self.act = SiLU()
elif self.activation in ['sigmoid']:
if self.glu:
self.act = nn.functional.glu
else:
print(
"Sigmoid activation function is recommended to be used with -glu"
)
raise NotImplementedError
self.in_proj_weight = Parameter(
torch.Tensor(inner_size * (2 if glu else 1), model_size))
self.out_proj_weight = Parameter(torch.Tensor(model_size, inner_size))
self.in_proj_bias = Parameter(
torch.Tensor(inner_size * (2 if glu else 1)))
self.out_proj_bias = Parameter(torch.Tensor(model_size))
self.reset_parameters()
self.fused = False
# At the moment fused mlp is supported for RELU, SiLU, Swish, GELU and AGELU (approximated GELU)
if not self.glu and \
self.activation in ['relu', 'silu', 'swish', 'gelu', 'agelu'] and not self.variational:
if self.activation == 'relu':
from onmt.modules.mlp.mlp import mlp_relu_function
if mlp_relu_function is not None:
self.fused_function = mlp_relu_function
self.fused = True
elif self.activation in ['silu', 'swish']:
from onmt.modules.mlp.mlp import mlp_silu_function
if mlp_silu_function is not None:
self.fused_function = mlp_silu_function
self.fused = True
elif self.activation == 'gelu':
if self.dropout_residual:
from onmt.modules.mlp.mlp import mlp_gelu_dropout_add_function
if mlp_gelu_dropout_add_function is not None:
self.fused_function = mlp_gelu_dropout_add_function
self.fused = True
self.fused_dropout_add = True
if not self.fused:
from onmt.modules.mlp.mlp import mlp_gelu_function
if mlp_gelu_function is not None:
self.fused_function = mlp_gelu_function
self.fused = True
elif self.activation == 'agelu':
from onmt.modules.mlp.mlp import mlp_agelu_function
if mlp_agelu_function is not None:
self.fused_function = mlp_agelu_function
self.fused = True
def reset_parameters(self, init='normal'):
if init == 'normal':
std_ = math.sqrt(2.0 / (self.model_size + self.inner_size))
nn.init.normal_(self.in_proj_weight, 0.0, std_)
nn.init.normal_(self.out_proj_weight, 0.0, std_)
else:
std_ = math.sqrt(6.0 / (self.model_size + self.inner_size))
nn.init.uniform_(self.in_proj_weight, -std_, std_)
nn.init.uniform_(self.out_proj_weight, -std_, std_)
nn.init.constant_(self.in_proj_bias, 0.0)
nn.init.constant_(self.out_proj_bias, 0.0)
def convert_autograd(self):
if self.autograd:
return
with torch.no_grad():
self.autograd = True
self.linear_in = torch.nn.Linear(self.model_size, self.inner_size)
self.linear_out = torch.nn.Linear(self.inner_size, self.model_size)
self.linear_in.weight.copy_(self.in_proj_weight)
self.linear_in.bias.copy_(self.in_proj_bias)
self.linear_out.weight.copy_(self.out_proj_weight)
self.linear_out.bias.copy_(self.out_proj_bias)
del self.in_proj_weight
del self.in_proj_bias
del self.out_proj_weight
del self.out_proj_bias
def forward(self, input, *args, **kwargs):
if self.fused and input.is_cuda and not self.autograd:
# if autocast is enabled: manually cast the function args into half manually
# for some reason custom_fwd(...) doesn't work
with autocast(enabled=False):
weights = [
self.in_proj_weight.half(),
self.out_proj_weight.half()
]
biases = [self.in_proj_bias.half(), self.out_proj_bias.half()]
seq_len, bsz, hidden_size = input.size(0), input.size(
1), input.size(2)
dropout = self.dropout if self.training else 0.0
if self.fused_dropout_add:
res_dropout = self.res_dropout if self.training else 0.0
hidden = self.fused_function(
dropout, res_dropout,
input.half().view(seq_len * bsz, -1), *weights,
*biases).type_as(input)
else:
recompute = onmt.constants.recompute
hidden = self.fused_function(
dropout, recompute,
input.half().view(seq_len * bsz, -1), *weights,
*biases).type_as(input)
hidden = hidden.view(seq_len, bsz, hidden_size)
# verification code (only with dropout = 0.0)
# with torch.no_grad():
# hidden_ = F.linear(self.act(F.linear(input, self.in_proj_weight, self.in_proj_bias)),
# self.out_proj_weight, self.out_proj_bias).type_as(hidden)
#
# if self.fused_dropout_add:
# hidden_.add_(input)
#
# comp = torch.allclose(hidden, hidden_, rtol=1e-02, atol=1e-03)
# if not comp:
# print("Warning! The fused function doesn't match the PyTorch function.")
# print(hidden - hidden_)
else:
if self.autograd:
hidden = self.linear_in(input)
else:
hidden = F.linear(input, self.in_proj_weight,
self.in_proj_bias)
if self.glu and self.activation != 'sigmoid':
hidden, gate = hidden.chunk(2, dim=-1)
hidden = self.act(hidden) * gate
else: # GLU function
hidden = self.act(hidden)
if not (not self.glu and self.activation == 'relu'):
if self.variational:
hidden = variational_dropout(
hidden,
p=self.dropout,
training=self.training,
inplace=self.activation
in ['silu', 'relu', 'swish', 'gelu'])
else:
hidden = F.dropout(hidden,
p=self.dropout,
training=self.training,
inplace=self.activation
in ['silu', 'relu', 'swish', 'gelu'])
if self.autograd:
hidden = self.linear_out(hidden)
else:
hidden = F.linear(hidden, self.out_proj_weight,
self.out_proj_bias)
if self.dropout_residual:
if not self.fused_dropout_add:
if not self.variational:
hidden = F.dropout(hidden,
p=self.res_dropout,
training=self.training) + input
else:
hidden = variational_dropout(
hidden, p=self.dropout, training=self.training) + input
return hidden