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# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
from fairseq import utils
from fairseq.models import (
FairseqLanguageModel,
register_model,
register_model_architecture,
)
from fairseq.models.fconv import FConvDecoder
from fairseq.utils import safe_hasattr
@register_model("fconv_lm")
class FConvLanguageModel(FairseqLanguageModel):
def __init__(self, decoder):
super().__init__(decoder)
@staticmethod
def add_args(parser):
"""Add model-specific arguments to the parser."""
parser.add_argument(
"--dropout", type=float, metavar="D", help="dropout probability"
)
parser.add_argument(
"--decoder-embed-dim",
type=int,
metavar="N",
help="decoder embedding dimension",
)
parser.add_argument(
"--decoder-layers",
type=str,
metavar="EXPR",
help="decoder layers [(dim, kernel_size), ...]",
)
parser.add_argument(
"--decoder-out-embed-dim",
type=int,
metavar="N",
help="decoder output embedding dimension",
)
parser.add_argument(
"--adaptive-softmax-cutoff",
metavar="EXPR",
help="comma separated list of adaptive softmax cutoff points. "
"Must be used with adaptive_loss criterion",
)
parser.add_argument(
"--adaptive-softmax-dropout",
type=float,
metavar="D",
help="sets adaptive softmax dropout for the tail projections",
)
parser.add_argument(
"--decoder-attention",
type=str,
metavar="EXPR",
help="decoder attention [True, ...]",
)
@classmethod
def build_model(cls, args, task):
"""Build a new model instance."""
# make sure all arguments are present in older models
base_lm_architecture(args)
if safe_hasattr(args, "max_target_positions") and not safe_hasattr(
args, "tokens_per_sample"
):
args.tokens_per_sample = args.max_target_positions
decoder = FConvDecoder(
dictionary=task.target_dictionary,
embed_dim=args.decoder_embed_dim,
convolutions=eval(args.decoder_layers),
out_embed_dim=args.decoder_embed_dim,
attention=eval(args.decoder_attention),
dropout=args.dropout,
max_positions=args.tokens_per_sample,
share_embed=False,
positional_embeddings=False,
adaptive_softmax_cutoff=(
utils.eval_str_list(args.adaptive_softmax_cutoff, type=int)
if args.criterion == "adaptive_loss"
else None
),
adaptive_softmax_dropout=args.adaptive_softmax_dropout,
)
return FConvLanguageModel(decoder)
@register_model_architecture("fconv_lm", "fconv_lm")
def base_lm_architecture(args):
args.dropout = getattr(args, "dropout", 0.1)
args.decoder_embed_dim = getattr(args, "decoder_embed_dim", 128)
args.decoder_layers = getattr(args, "decoder_layers", "[(1268, 4)] * 13")
args.decoder_attention = getattr(args, "decoder_attention", "False")
args.adaptive_softmax_cutoff = getattr(args, "adaptive_softmax_cutoff", None)
args.adaptive_softmax_dropout = getattr(args, "adaptive_softmax_dropout", 0)
@register_model_architecture("fconv_lm", "fconv_lm_dauphin_wikitext103")
def fconv_lm_dauphin_wikitext103(args):
layers = "[(850, 6)] * 3"
layers += " + [(850, 1)] * 1"
layers += " + [(850, 5)] * 4"
layers += " + [(850, 1)] * 1"
layers += " + [(850, 4)] * 3"
layers += " + [(1024, 4)] * 1"
layers += " + [(2048, 4)] * 1"
args.decoder_embed_dim = getattr(args, "decoder_embed_dim", 280)
args.decoder_layers = getattr(args, "decoder_layers", layers)
args.decoder_attention = getattr(args, "decoder_attention", "False")
args.adaptive_softmax_cutoff = getattr(
args, "adaptive_softmax_cutoff", "10000,20000,200000"
)
base_lm_architecture(args)
@register_model_architecture("fconv_lm", "fconv_lm_dauphin_gbw")
def fconv_lm_dauphin_gbw(args):
layers = "[(512, 5)]"
layers += " + [(128, 1, 0), (128, 5, 0), (512, 1, 3)] * 3"
layers += " + [(512, 1, 0), (512, 5, 0), (1024, 1, 3)] * 3"
layers += " + [(1024, 1, 0), (1024, 5, 0), (2048, 1, 3)] * 6"
layers += " + [(1024, 1, 0), (1024, 5, 0), (4096, 1, 3)]"
args.decoder_embed_dim = getattr(args, "decoder_embed_dim", 128)
args.decoder_layers = getattr(args, "decoder_layers", layers)
args.decoder_attention = getattr(args, "decoder_attention", "False")
args.adaptive_softmax_cutoff = getattr(
args, "adaptive_softmax_cutoff", "10000,50000,200000"
)
base_lm_architecture(args)
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