def __init__(self,
pretrained_model_name: Optional[str] = None,
cache_dir: Optional[str] = None,
hparams=None,
init=True):
super().__init__(hparams=hparams)
self.load_pretrained_config(pretrained_model_name, cache_dir)
num_layers = self._hparams.num_layers
num_heads = self._hparams.num_heads
head_dim = self._hparams.head_dim
self.word_embed = nn.Embedding(self._hparams.vocab_size,
self._hparams.hidden_dim)
self.pos_embed = RelativePositionalEncoding(
hparams={
"dim": self._hparams.hidden_dim,
"max_seq_len": self._hparams.max_seq_length,
})
self.dropout = nn.Dropout(self._hparams.dropout)
self.r_r_bias = None
self.r_w_bias = None
self.r_s_bias = None
if not self._hparams.untie_r:
self.r_r_bias = nn.Parameter(torch.Tensor(num_heads, head_dim))
self.r_w_bias = nn.Parameter(torch.Tensor(num_heads, head_dim))
self.r_s_bias = (nn.Parameter(torch.Tensor(num_heads, head_dim))
if self._hparams.use_segments else None)
self.attn_layers = nn.ModuleList()
self.ff_layers = nn.ModuleList()
rel_attn_hparams = dict_fetch(
self._hparams, RelativeMultiheadAttention.default_hparams())
ff_hparams = dict_fetch(self._hparams,
PositionWiseFF.default_hparams())
for _ in range(num_layers):
self.attn_layers.append(
RelativeMultiheadAttention(self.r_r_bias,
self.r_w_bias,
self.r_s_bias,
hparams=rel_attn_hparams))
self.ff_layers.append(PositionWiseFF(hparams=ff_hparams))
self.mask_emb = nn.Parameter(
torch.Tensor(1, 1, self._hparams.hidden_dim))
if init:
self.init_pretrained_weights()
def __init__(self, hparams=None):
ClassifierBase.__init__(self, hparams)
with tf.variable_scope(self.variable_scope):
encoder_hparams = utils.dict_fetch(
hparams, Conv1DEncoder.default_hparams())
self._encoder = Conv1DEncoder(hparams=encoder_hparams)
# Add an additional dense layer if needed
self._num_classes = self._hparams.num_classes
if self._num_classes > 0:
if self._hparams.num_dense_layers <= 0:
self._encoder.append_layer({"type": "Flatten"})
logit_kwargs = self._hparams.logit_layer_kwargs
if logit_kwargs is None:
logit_kwargs = {}
elif not isinstance(logit_kwargs, HParams):
raise ValueError(
"hparams['logit_layer_kwargs'] must be a dict.")
else:
logit_kwargs = logit_kwargs.todict()
logit_kwargs.update({"units": self._num_classes})
if 'name' not in logit_kwargs:
logit_kwargs['name'] = "logit_layer"
self._encoder.append_layer(
{"type": "Dense", "kwargs": logit_kwargs})
def __init__(self, in_channels: int, in_features: Optional[int] = None,
hparams: Optional[Union[HParams, Dict[str, Any]]] = None):
super().__init__(hparams=hparams)
encoder_hparams = utils.dict_fetch(hparams,
Conv1DEncoder.default_hparams())
self._encoder = Conv1DEncoder(in_channels=in_channels,
in_features=in_features,
hparams=encoder_hparams)
# Add an additional dense layer if needed
self._num_classes = self._hparams.num_classes
if self._num_classes > 0:
if self._hparams.num_dense_layers <= 0:
self._encoder.append_layer({"type": "Flatten"})
logit_kwargs = self._hparams.logit_layer_kwargs
if logit_kwargs is None:
logit_kwargs = {}
elif not isinstance(logit_kwargs, HParams):
raise ValueError(
"hparams['logit_layer_kwargs'] must be a dict.")
else:
logit_kwargs = logit_kwargs.todict()
logit_kwargs.update({"out_features": self._num_classes})
self._encoder.append_layer({"type": "Linear",
"kwargs": logit_kwargs})
def __init__(self,
pretrained_model_name: Optional[str] = None,
cache_dir: Optional[str] = None,
hparams=None):
super().__init__(hparams=hparams)
# Create the underlying encoder
encoder_hparams = dict_fetch(hparams, XLNetEncoder.default_hparams())
self._encoder = XLNetEncoder(
pretrained_model_name=pretrained_model_name,
cache_dir=cache_dir,
hparams=encoder_hparams)
# TODO: The logic here is very similar to that in XLNetClassifier.
# We need to reduce the code redundancy.
if self._hparams.use_projection:
if self._hparams.regr_strategy == 'all_time':
self.projection = nn.Linear(
self._encoder.output_size * self._hparams.max_seq_length,
self._encoder.output_size * self._hparams.max_seq_length)
else:
self.projection = nn.Linear(self._encoder.output_size,
self._encoder.output_size)
self.dropout = nn.Dropout(self._hparams.dropout)
logit_kwargs = self._hparams.logit_layer_kwargs
if logit_kwargs is None:
logit_kwargs = {}
elif not isinstance(logit_kwargs, HParams):
raise ValueError("hparams['logit_layer_kwargs'] "
"must be a dict.")
else:
logit_kwargs = logit_kwargs.todict()
if self._hparams.regr_strategy == 'all_time':
self.hidden_to_logits = nn.Linear(
self._encoder.output_size * self._hparams.max_seq_length, 1,
**logit_kwargs)
else:
self.hidden_to_logits = nn.Linear(self._encoder.output_size, 1,
**logit_kwargs)
if self._hparams.initializer:
initialize = get_initializer(self._hparams.initializer)
assert initialize is not None
if self._hparams.use_projection:
initialize(self.projection.weight)
initialize(self.projection.bias)
initialize(self.hidden_to_logits.weight)
if self.hidden_to_logits.bias:
initialize(self.hidden_to_logits.bias)
else:
if self._hparams.use_projection:
self.projection.apply(init_weights)
self.hidden_to_logits.apply(init_weights)
def __init__(self,
pretrained_model_name: Optional[str] = None,
cache_dir: Optional[str] = None,
hparams=None):
super().__init__(hparams=hparams)
# Create the underlying encoder
encoder_hparams = dict_fetch(hparams, GPT2Encoder.default_hparams())
self._encoder = GPT2Encoder(
pretrained_model_name=pretrained_model_name,
cache_dir=cache_dir,
hparams=encoder_hparams)
# Create a dropout layer
self._dropout_layer = nn.Dropout(self._hparams.dropout)
# Create an additional classification layer if needed
self.num_classes = self._hparams.num_classes
if self.num_classes <= 0:
self._logits_layer = None
else:
logit_kwargs = self._hparams.logit_layer_kwargs
if logit_kwargs is None:
logit_kwargs = {}
elif not isinstance(logit_kwargs, HParams):
raise ValueError("hparams['logit_layer_kwargs'] "
"must be a dict.")
else:
logit_kwargs = logit_kwargs.todict()
if self._hparams.clas_strategy == 'all_time':
self._logits_layer = nn.Linear(
self._encoder.output_size * self._hparams.max_seq_length,
self.num_classes, **logit_kwargs)
else:
self._logits_layer = nn.Linear(self._encoder.output_size,
self.num_classes,
**logit_kwargs)
if self._hparams.initializer:
initialize = get_initializer(self._hparams.initializer)
assert initialize is not None
if self._logits_layer is not None:
initialize(self._logits_layer.weight)
if self._logits_layer.bias is not None:
initialize(self._logits_layer.bias)
self.is_binary = (self.num_classes == 1) or \
(self.num_classes <= 0 and
self._hparams.dim == 1)
def __init__(self,
pretrained_model_name=None,
cache_dir=None,
hparams=None):
ClassifierBase.__init__(self, hparams)
with tf.variable_scope(self.variable_scope):
# Creates the underlying encoder
encoder_hparams = utils.dict_fetch(
hparams, BertEncoder.default_hparams())
if encoder_hparams is not None:
encoder_hparams['name'] = None
self._encoder = BertEncoder(
pretrained_model_name=pretrained_model_name,
cache_dir=cache_dir,
hparams=encoder_hparams)
# Creates an dropout layer
drop_kwargs = {"rate": self._hparams.dropout}
layer_hparams = {"type": "Dropout", "kwargs": drop_kwargs}
self._dropout_layer = layers.get_layer(hparams=layer_hparams)
# Creates an additional classification layer if needed
self._num_classes = self._hparams.num_classes
if self._num_classes <= 0:
self._logit_layer = None
else:
logit_kwargs = self._hparams.logit_layer_kwargs
if logit_kwargs is None:
logit_kwargs = {}
elif not isinstance(logit_kwargs, HParams):
raise ValueError(
"hparams['logit_layer_kwargs'] must be a dict.")
else:
logit_kwargs = logit_kwargs.todict()
logit_kwargs.update({"units": self._num_classes})
if 'name' not in logit_kwargs:
logit_kwargs['name'] = "logit_layer"
layer_hparams = {"type": "Dense", "kwargs": logit_kwargs}
self._logit_layer = layers.get_layer(hparams=layer_hparams)
def __init__(self,
cell=None,
cell_dropout_mode=None,
output_layer=None,
hparams=None):
ClassifierBase.__init__(self, hparams)
with tf.variable_scope(self.variable_scope):
# Creates the underlying encoder
encoder_hparams = utils.dict_fetch(
hparams, UnidirectionalRNNEncoder.default_hparams())
if encoder_hparams is not None:
encoder_hparams['name'] = None
self._encoder = UnidirectionalRNNEncoder(
cell=cell,
cell_dropout_mode=cell_dropout_mode,
output_layer=output_layer,
hparams=encoder_hparams)
# Creates an additional classification layer if needed
self._num_classes = self._hparams.num_classes
if self._num_classes <= 0:
self._logit_layer = None
else:
logit_kwargs = self._hparams.logit_layer_kwargs
if logit_kwargs is None:
logit_kwargs = {}
elif not isinstance(logit_kwargs, HParams):
raise ValueError(
"hparams['logit_layer_kwargs'] must be a dict.")
else:
logit_kwargs = logit_kwargs.todict()
logit_kwargs.update({"units": self._num_classes})
if 'name' not in logit_kwargs:
logit_kwargs['name'] = "logit_layer"
layer_hparams = {"type": "Dense", "kwargs": logit_kwargs}
self._logit_layer = layers.get_layer(hparams=layer_hparams)