def __init__(
self,
vocab_size: int,
encoder_output_size: int,
attention_heads: int = 4,
linear_units: int = 2048,
num_blocks: int = 6,
dropout_rate: float = 0.1,
positional_dropout_rate: float = 0.1,
self_attention_dropout_rate: float = 0.0,
src_attention_dropout_rate: float = 0.0,
input_layer: str = "embed",
use_output_layer: bool = True,
pos_enc_class=PositionalEncoding,
normalize_before: bool = True,
concat_after: bool = False,
):
assert check_argument_types()
super().__init__()
attention_dim = encoder_output_size
if input_layer == "embed":
self.embed = torch.nn.Sequential(
torch.nn.Embedding(vocab_size, attention_dim),
pos_enc_class(attention_dim, positional_dropout_rate),
)
elif input_layer == "linear":
self.embed = torch.nn.Sequential(
torch.nn.Linear(vocab_size, attention_dim),
torch.nn.LayerNorm(attention_dim),
torch.nn.Dropout(dropout_rate),
torch.nn.ReLU(),
pos_enc_class(attention_dim, positional_dropout_rate),
)
else:
raise ValueError(
f"only 'embed' or 'linear' is supported: {input_layer}")
self.normalize_before = normalize_before
self.decoders = repeat(
num_blocks,
lambda: DecoderLayer(
attention_dim,
MultiHeadedAttention(attention_heads, attention_dim,
self_attention_dropout_rate),
MultiHeadedAttention(attention_heads, attention_dim,
src_attention_dropout_rate),
PositionwiseFeedForward(attention_dim, linear_units,
dropout_rate),
dropout_rate,
normalize_before,
concat_after,
),
)
if self.normalize_before:
self.after_norm = LayerNorm(attention_dim)
if use_output_layer:
self.output_layer = torch.nn.Linear(attention_dim, vocab_size)
else:
self.output_layer = None
def __init__(
self,
vocab_size: int,
encoder_output_size: int,
attention_heads: int = 4,
linear_units: int = 2048,
num_blocks: int = 6,
dropout_rate: float = 0.1,
positional_dropout_rate: float = 0.1,
self_attention_dropout_rate: float = 0.0,
src_attention_dropout_rate: float = 0.0,
input_layer: str = "embed",
use_output_layer: bool = True,
pos_enc_class=PositionalEncoding,
normalize_before: bool = True,
concat_after: bool = False,
conv_wshare: int = 4,
conv_kernel_length: Sequence[int] = (11, 11, 11, 11, 11, 11),
conv_usebias: int = False,
):
assert check_argument_types()
if len(conv_kernel_length) != num_blocks:
raise ValueError(
"conv_kernel_length must have equal number of values to num_blocks: "
f"{len(conv_kernel_length)} != {num_blocks}")
super().__init__(
vocab_size=vocab_size,
encoder_output_size=encoder_output_size,
dropout_rate=dropout_rate,
positional_dropout_rate=positional_dropout_rate,
input_layer=input_layer,
use_output_layer=use_output_layer,
pos_enc_class=pos_enc_class,
normalize_before=normalize_before,
)
attention_dim = encoder_output_size
self.decoders = repeat(
num_blocks,
lambda lnum: DecoderLayer(
attention_dim,
DynamicConvolution2D(
wshare=conv_wshare,
n_feat=attention_dim,
dropout_rate=self_attention_dropout_rate,
kernel_size=conv_kernel_length[lnum],
use_kernel_mask=True,
use_bias=conv_usebias,
),
MultiHeadedAttention(attention_heads, attention_dim,
src_attention_dropout_rate),
PositionwiseFeedForward(attention_dim, linear_units,
dropout_rate),
dropout_rate,
normalize_before,
concat_after,
),
)
def __init__(self, odim,
attention_dim=256,
attention_heads=4,
linear_units=2048,
num_blocks=6,
dropout_rate=0.1,
positional_dropout_rate=0.1,
self_attention_dropout_rate=0.0,
src_attention_dropout_rate=0.0,
input_layer="embed",
use_output_layer=True,
pos_enc_class=PositionalEncoding,
normalize_before=True,
concat_after=False):
"""Construct an Decoder object."""
torch.nn.Module.__init__(self)
if input_layer == "embed":
self.embed = torch.nn.Sequential(
torch.nn.Embedding(odim, attention_dim),
pos_enc_class(attention_dim, positional_dropout_rate)
)
elif input_layer == "linear":
self.embed = torch.nn.Sequential(
torch.nn.Linear(odim, attention_dim),
torch.nn.LayerNorm(attention_dim),
torch.nn.Dropout(dropout_rate),
torch.nn.ReLU(),
pos_enc_class(attention_dim, positional_dropout_rate)
)
elif isinstance(input_layer, torch.nn.Module):
self.embed = torch.nn.Sequential(
input_layer,
pos_enc_class(attention_dim, positional_dropout_rate)
)
else:
raise NotImplementedError("only `embed` or torch.nn.Module is supported.")
self.normalize_before = normalize_before
self.decoders = repeat(
num_blocks,
lambda: DecoderLayer(
attention_dim,
MultiHeadedAttention(attention_heads, attention_dim, self_attention_dropout_rate),
MultiHeadedAttention(attention_heads, attention_dim, src_attention_dropout_rate),
PositionwiseFeedForward(attention_dim, linear_units, dropout_rate),
dropout_rate,
normalize_before,
concat_after
)
)
if self.normalize_before:
self.after_norm = LayerNorm(attention_dim)
if use_output_layer:
self.output_layer = torch.nn.Linear(attention_dim, odim)
else:
self.output_layer = None
def __init__(
self,
vocab_size: int,
encoder_output_size: int,
attention_heads: int = 4,
linear_units: int = 2048,
num_blocks: int = 6,
dropout_rate: float = 0.1,
positional_dropout_rate: float = 0.1,
self_attention_dropout_rate: float = 0.0,
src_attention_dropout_rate: float = 0.0,
input_layer: str = "embed",
use_output_layer: bool = True,
pos_enc_class=PositionalEncoding,
normalize_before: bool = True,
concat_after: bool = False,
):
assert check_argument_types()
super().__init__(
vocab_size=vocab_size,
encoder_output_size=encoder_output_size,
dropout_rate=dropout_rate,
positional_dropout_rate=positional_dropout_rate,
input_layer=input_layer,
use_output_layer=use_output_layer,
pos_enc_class=pos_enc_class,
normalize_before=normalize_before,
)
attention_dim = encoder_output_size
self.decoders = repeat(
num_blocks,
lambda lnum: DecoderLayer(
attention_dim,
MultiHeadedAttention(attention_heads, attention_dim,
self_attention_dropout_rate),
MultiHeadedAttention(attention_heads, attention_dim,
src_attention_dropout_rate),
PositionwiseFeedForward(attention_dim, linear_units,
dropout_rate),
dropout_rate,
normalize_before,
concat_after,
),
)
def __init__(self, odim, args):
super(Decoder, self).__init__()
self.embed = torch.nn.Sequential(
torch.nn.Embedding(odim, args.adim),
PositionalEncoding(args.adim, args.dropout_rate)
)
self.decoders = repeat(
args.dlayers,
lambda: DecoderLayer(
args.adim,
MultiHeadedAttention(args.aheads, args.adim, args.transformer_attn_dropout_rate),
MultiHeadedAttention(args.aheads, args.adim, args.transformer_attn_dropout_rate),
PositionwiseFeedForward(args.adim, args.dunits, args.dropout_rate),
args.dropout_rate
)
)
self.output_norm = LayerNorm(args.adim)
self.output_layer = torch.nn.Linear(args.adim, odim)
def __init__(
self,
odim,
selfattention_layer_type="selfattn",
attention_dim=256,
attention_heads=4,
conv_wshare=4,
conv_kernel_length=11,
conv_usebias=False,
linear_units=2048,
num_blocks=6,
dropout_rate=0.1,
positional_dropout_rate=0.1,
self_attention_dropout_rate=0.0,
src_attention_dropout_rate=0.0,
input_layer="embed",
use_output_layer=True,
pos_enc_class=PositionalEncoding,
normalize_before=True,
concat_after=False,
):
"""Construct an Decoder object."""
torch.nn.Module.__init__(self)
self._register_load_state_dict_pre_hook(_pre_hook)
if input_layer == "embed":
self.embed = torch.nn.Sequential(
torch.nn.Embedding(odim, attention_dim),
pos_enc_class(attention_dim, positional_dropout_rate),
)
elif input_layer == "linear":
self.embed = torch.nn.Sequential(
torch.nn.Linear(odim, attention_dim),
torch.nn.LayerNorm(attention_dim),
torch.nn.Dropout(dropout_rate),
torch.nn.ReLU(),
pos_enc_class(attention_dim, positional_dropout_rate),
)
elif isinstance(input_layer, torch.nn.Module):
self.embed = torch.nn.Sequential(
input_layer,
pos_enc_class(attention_dim, positional_dropout_rate))
else:
raise NotImplementedError(
"only `embed` or torch.nn.Module is supported.")
self.normalize_before = normalize_before
# self-attention module definition
if selfattention_layer_type == "selfattn":
logging.info("decoder self-attention layer type = self-attention")
decoder_selfattn_layer = MultiHeadedAttention
decoder_selfattn_layer_args = [(
attention_heads,
attention_dim,
self_attention_dropout_rate,
)] * num_blocks
elif selfattention_layer_type == "lightconv":
logging.info(
"decoder self-attention layer type = lightweight convolution")
decoder_selfattn_layer = LightweightConvolution
decoder_selfattn_layer_args = [(
conv_wshare,
attention_dim,
self_attention_dropout_rate,
int(conv_kernel_length.split("_")[lnum]),
True,
conv_usebias,
) for lnum in range(num_blocks)]
elif selfattention_layer_type == "lightconv2d":
logging.info("decoder self-attention layer "
"type = lightweight convolution 2-dimentional")
decoder_selfattn_layer = LightweightConvolution2D
decoder_selfattn_layer_args = [(
conv_wshare,
attention_dim,
self_attention_dropout_rate,
int(conv_kernel_length.split("_")[lnum]),
True,
conv_usebias,
) for lnum in range(num_blocks)]
elif selfattention_layer_type == "dynamicconv":
logging.info(
"decoder self-attention layer type = dynamic convolution")
decoder_selfattn_layer = DynamicConvolution
decoder_selfattn_layer_args = [(
conv_wshare,
attention_dim,
self_attention_dropout_rate,
int(conv_kernel_length.split("_")[lnum]),
True,
conv_usebias,
) for lnum in range(num_blocks)]
elif selfattention_layer_type == "dynamicconv2d":
logging.info(
"decoder self-attention layer type = dynamic convolution 2-dimentional"
)
decoder_selfattn_layer = DynamicConvolution2D
decoder_selfattn_layer_args = [(
conv_wshare,
attention_dim,
self_attention_dropout_rate,
int(conv_kernel_length.split("_")[lnum]),
True,
conv_usebias,
) for lnum in range(num_blocks)]
self.decoders = repeat(
num_blocks,
lambda lnum: DecoderLayer(
attention_dim,
decoder_selfattn_layer(*decoder_selfattn_layer_args[lnum]),
MultiHeadedAttention(attention_heads, attention_dim,
src_attention_dropout_rate),
PositionwiseFeedForward(attention_dim, linear_units,
dropout_rate),
dropout_rate,
normalize_before,
concat_after,
),
)
self.selfattention_layer_type = selfattention_layer_type
if self.normalize_before:
self.after_norm = LayerNorm(attention_dim)
if use_output_layer:
self.output_layer = torch.nn.Linear(attention_dim, odim)
else:
self.output_layer = None
def __init__(
self,
odim,
selfattention_layer_type="selfattn",
attention_dim=256,
attention_heads=4,
conv_wshare=4,
conv_kernel_length=11,
conv_usebias=False,
linear_units=2048,
num_blocks=6,
dropout_rate=0.1,
positional_dropout_rate=0.1,
self_attention_dropout_rate=0.0,
src_attention_dropout_rate=0.0,
input_layer="embed",
use_output_layer=True,
pos_enc_class=PositionalEncoding,
normalize_before=True,
concat_after=False,
attention_type="self_attn",
max_attn_span=[None],
span_init=0,
span_ratio=0.5,
ratio_adaptive=False
):
"""Construct an Decoder object."""
torch.nn.Module.__init__(self)
self._register_load_state_dict_pre_hook(_pre_hook)
if input_layer == "embed":
self.embed = torch.nn.Sequential(
torch.nn.Embedding(odim, attention_dim),
pos_enc_class(attention_dim, positional_dropout_rate),
)
elif input_layer == "linear":
self.embed = torch.nn.Sequential(
torch.nn.Linear(odim, attention_dim),
torch.nn.LayerNorm(attention_dim),
torch.nn.Dropout(dropout_rate),
torch.nn.ReLU(),
pos_enc_class(attention_dim, positional_dropout_rate),
)
elif isinstance(input_layer, torch.nn.Module):
self.embed = torch.nn.Sequential(
input_layer, pos_enc_class(attention_dim, positional_dropout_rate)
)
else:
raise NotImplementedError("only `embed` or torch.nn.Module is supported.")
self.normalize_before = normalize_before
if selfattention_layer_type == "selfattn":
logging.info("decoder self-attention layer type = self-attention")
self.decoders = repeat(
num_blocks,
lambda lnum: DecoderLayer(
attention_dim,
multi_headed_attention(attention_heads, attention_dim, self_attention_dropout_rate,
attention_type, max_span=max_attn_span[min(len(max_attn_span)-1, lnum)],
span_init=span_init, span_ratio=span_ratio, ratio_adaptive=ratio_adaptive,
causal_flag=True),
MultiHeadedAttention(
attention_heads, attention_dim, src_attention_dropout_rate
),
PositionwiseFeedForward(attention_dim, linear_units, dropout_rate),
dropout_rate,
normalize_before,
concat_after,
),
)
elif selfattention_layer_type == "lightconv":
logging.info("decoder self-attention layer type = lightweight convolution")
self.decoders = repeat(
num_blocks,
lambda lnum: DecoderLayer(
attention_dim,
LightweightConvolution(
conv_wshare,
attention_dim,
self_attention_dropout_rate,
conv_kernel_length,
lnum,
use_kernel_mask=True,
use_bias=conv_usebias,
),
MultiHeadedAttention(
attention_heads, attention_dim, src_attention_dropout_rate
),
PositionwiseFeedForward(attention_dim, linear_units, dropout_rate),
dropout_rate,
normalize_before,
concat_after,
),
)
elif selfattention_layer_type == "lightconv2d":
logging.info(
"decoder self-attention layer "
"type = lightweight convolution 2-dimentional"
)
self.decoders = repeat(
num_blocks,
lambda lnum: DecoderLayer(
attention_dim,
LightweightConvolution2D(
conv_wshare,
attention_dim,
self_attention_dropout_rate,
conv_kernel_length,
lnum,
use_kernel_mask=True,
use_bias=conv_usebias,
),
MultiHeadedAttention(
attention_heads, attention_dim, src_attention_dropout_rate
),
PositionwiseFeedForward(attention_dim, linear_units, dropout_rate),
dropout_rate,
normalize_before,
concat_after,
),
)
elif selfattention_layer_type == "dynamicconv":
logging.info("decoder self-attention layer type = dynamic convolution")
self.decoders = repeat(
num_blocks,
lambda lnum: DecoderLayer(
attention_dim,
DynamicConvolution(
conv_wshare,
attention_dim,
self_attention_dropout_rate,
conv_kernel_length,
lnum,
use_kernel_mask=True,
use_bias=conv_usebias,
),
MultiHeadedAttention(
attention_heads, attention_dim, src_attention_dropout_rate
),
PositionwiseFeedForward(attention_dim, linear_units, dropout_rate),
dropout_rate,
normalize_before,
concat_after,
),
)
elif selfattention_layer_type == "dynamicconv2d":
logging.info(
"decoder self-attention layer type = dynamic convolution 2-dimentional"
)
self.decoders = repeat(
num_blocks,
lambda lnum: DecoderLayer(
attention_dim,
DynamicConvolution2D(
conv_wshare,
attention_dim,
self_attention_dropout_rate,
conv_kernel_length,
lnum,
use_kernel_mask=True,
use_bias=conv_usebias,
),
MultiHeadedAttention(
attention_heads, attention_dim, src_attention_dropout_rate
),
PositionwiseFeedForward(attention_dim, linear_units, dropout_rate),
dropout_rate,
normalize_before,
concat_after,
),
)
self.selfattention_layer_type = selfattention_layer_type
if self.normalize_before:
self.after_norm = LayerNorm(attention_dim)
if use_output_layer:
self.output_layer = torch.nn.Linear(attention_dim, odim)
else:
self.output_layer = None
def __init__(self,
odim,
attention_dim=256,
attention_heads=4,
linear_units=2048,
num_blocks=6,
dropout_rate=0.1,
positional_dropout_rate=0.1,
self_attention_dropout_rate=0.0,
src_attention_dropout_rate=0.0,
input_layer="embed",
use_output_layer=True,
pos_enc_class=PositionalEncoding,
normalize_before=True,
concat_after=False,
cross_operator=None,
cross_shared=False,
cross_weight_learnable=False,
cross_weight=0.0):
"""Construct an Decoder object."""
torch.nn.Module.__init__(self)
if input_layer == "embed":
self.embed = torch.nn.Sequential(
torch.nn.Embedding(odim, attention_dim),
pos_enc_class(attention_dim, positional_dropout_rate))
elif input_layer == "linear":
self.embed = torch.nn.Sequential(
torch.nn.Linear(odim, attention_dim),
torch.nn.LayerNorm(attention_dim),
torch.nn.Dropout(dropout_rate), torch.nn.ReLU(),
pos_enc_class(attention_dim, positional_dropout_rate))
elif isinstance(input_layer, torch.nn.Module):
self.embed = torch.nn.Sequential(
input_layer,
pos_enc_class(attention_dim, positional_dropout_rate))
else:
raise NotImplementedError(
"only `embed` or torch.nn.Module is supported.")
self.normalize_before = normalize_before
cross_self_attn = None
cross_src_attn = None
if cross_operator:
if 'src_' in cross_operator:
# cross_src_attn = MultiHeadedAttention(attention_heads, attention_dim, self_attention_dropout_rate)
cross_src_attn = True
if 'self_' in cross_operator:
if cross_shared and cross_src_attn is not None:
# cross_self_attn = cross_src_attn
cross_self_attn = True # TODO: backward compatibility for shared self and source
else:
# cross_self_attn = MultiHeadedAttention(attention_heads, attention_dim, self_attention_dropout_rate)
cross_self_attn = True
if 'concat' in cross_operator:
cross_operator = 'concat'
elif 'sum' in cross_operator:
cross_operator = 'sum'
else:
raise NotImplementedError
self.decoders = repeat(
num_blocks, lambda: DecoderLayer(
attention_dim,
MultiHeadedAttention(attention_heads, attention_dim,
self_attention_dropout_rate),
MultiHeadedAttention(attention_heads, attention_dim,
src_attention_dropout_rate),
PositionwiseFeedForward(attention_dim, linear_units,
dropout_rate),
dropout_rate,
normalize_before,
concat_after,
cross_self_attn=MultiHeadedAttention(
attention_heads, attention_dim, self_attention_dropout_rate
) if cross_self_attn else None,
cross_src_attn=MultiHeadedAttention(
attention_heads, attention_dim, self_attention_dropout_rate
) if cross_src_attn else None,
cross_operator=cross_operator,
cross_shared=cross_shared,
cross_weight_learnable=cross_weight_learnable,
cross_weight=cross_weight))
if self.normalize_before:
self.after_norm = LayerNorm(attention_dim)
if use_output_layer:
self.output_layer = torch.nn.Linear(attention_dim, odim)
else:
self.output_layer = None