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train.py
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train.py
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__all__ = ["train", "TrainArguments", "Record", "create_loss"]
import pprint
import random
import pathlib
import functools
import itertools
import logging
import logging.config
from dataclasses import dataclass, field
from typing import Optional, Sequence, ClassVar
import yaap
import inflect
import torch
import torch.utils.data as td
import torch.optim as op
import torch.utils.tensorboard
import torchmodels
import utils
import models
import models.dialog
import datasets
import losses
from datasets import Dialog
from evaluators import SpeakerEvaluator
from evaluators import DialogStateEvaluator
from evaluators import DistinctEvaluator
from evaluators import SentLengthEvaluator
from evaluators import RougeEvaluator
from evaluators import PosteriorEvaluator
from evaluators import DialogLengthEvaluator
from evaluators import WordEntropyEvaluator
from loopers import LossInferencer
from loopers import TrainInferencer
from loopers import EvaluatingInferencer
from loopers import VHDAInferencer
from loopers import LogInferencer
from loopers import Generator
from loopers import LogGenerator
from loopers import BeamSearchGenerator
from loopers import EvaluatingGenerator
def create_loss(model, vocabs: datasets.VocabSet,
kld_weight: utils.Scheduler = utils.ConstantScheduler(1.0),
enable_kl=True, kl_mode="kl-mi") -> losses.Loss:
assert kl_mode in {"kl", "kl-mi", "kl-mi+"}
if isinstance(model, models.VHDA):
return losses.VHDALoss(
vocabs=vocabs,
kld_weight=kld_weight,
enable_kl=enable_kl,
kl_mode=kl_mode
)
elif isinstance(model, models.VHCR):
return losses.VHCRLoss(
vocabs=vocabs,
enable_kl=enable_kl,
kld_weight=kld_weight,
kl_mode=kl_mode
)
elif isinstance(model, models.HDA):
return losses.HDALoss(
vocabs=vocabs
)
elif isinstance(model, models.VHDAWithoutGoal):
return losses.VHDAWithoutGoalLoss(
vocabs=vocabs,
kld_weight=kld_weight,
enable_kl=enable_kl,
kl_mode=kl_mode
)
elif isinstance(model, models.VHDAWithoutGoalAct):
return losses.VHDAWithoutGoalActLoss(
vocabs=vocabs,
kld_weight=kld_weight,
enable_kl=enable_kl,
calibrate_mi="mi" in kl_mode
)
elif isinstance(model, models.VHRED):
return losses.VHREDLoss(
vocabs=vocabs,
enable_kl=enable_kl,
kld_weight=kld_weight
)
elif isinstance(model, models.VHUS):
return losses.VHUSLoss(
vocabs=vocabs,
enable_kl=enable_kl,
kld_weight=kld_weight
)
else:
raise RuntimeError(f"unsupported model: {type(model)}")
@dataclass
class TrainArguments(utils.Arguments):
model: models.AbstractTDA
train_data: Sequence[Dialog]
valid_data: Sequence[Dialog]
processor: datasets.DialogProcessor
device: torch.device = torch.device("cpu")
save_dir: pathlib.Path = pathlib.Path("out")
report_every: Optional[int] = None
batch_size: int = 32
valid_batch_size: int = 64
optimizer: str = "adam"
gradient_clip: Optional[float] = None
l2norm_weight: Optional[float] = None
learning_rate: float = 0.001
num_epochs: int = 10
kld_schedule: utils.Scheduler = utils.ConstantScheduler(1.0)
dropout_schedule: utils.Scheduler = utils.ConstantScheduler(1.0)
validate_every: int = 1
beam_size: int = 4
max_gen_len: int = 30
early_stop: bool = False
early_stop_criterion: str = "~val-loss"
early_stop_patience: Optional[int] = None
save_every: Optional[int] = None
disable_kl: bool = False
kl_mode: str = "kl-mi"
@dataclass
class FinegrainedValidator(LogInferencer, EvaluatingInferencer, LossInferencer):
def on_run_started(self, dataloader: td.DataLoader) -> td.DataLoader:
ret = super().on_run_started(dataloader)
self.model.eval()
return ret
@dataclass
class GenerativeValidator(
LogGenerator,
EvaluatingGenerator,
BeamSearchGenerator,
Generator
):
pass
@dataclass
class Record:
state_dict: dict = field(repr=False)
criterion: float
epoch_idx: int
summary: utils.TensorMap
def to_short_json(self):
return {
"criterion": self.criterion,
"epoch": self.epoch_idx,
"summary": {k: v.item() for k, v in
self.summary.items() if k.count("-") < 2}
}
def to_json(self):
return {
"criterion": self.criterion,
"epoch": self.epoch_idx,
"summary": {k: v.item() for k, v in self.summary.items()}
}
@dataclass
class Trainer(LogInferencer, EvaluatingInferencer, TrainInferencer):
save_dir: pathlib.Path = None
num_epochs: int = 10
fin_valid: FinegrainedValidator = None
gen_valid: GenerativeValidator = None
validate_every: int = 1
early_stop: bool = False
early_stop_criterion: str = "~val-loss" # use 'tilde' to denote negation
early_stop_patience: Optional[int] = None
save_every: Optional[int] = None
_best_record: Record = field(init=False, repr=False, default=None)
_eidx: int = field(init=False, default=None)
_val_dataloader: Optional[td.DataLoader] = field(init=False, default=None)
_continue: bool = field(init=False, default=True)
_engine: ClassVar[inflect.engine] = inflect.engine()
def __post_init__(self):
super().__post_init__()
if self.save_dir is None:
raise ValueError(f"must provide save dir")
if self.fin_valid is None:
raise ValueError(f"must provide a (fine-grained) validator")
if self.gen_valid is None:
raise ValueError(f"must provide a (dialog) validator")
if self.gen_valid is None:
raise ValueError(f"must provide a generator")
self.save_dir.mkdir(exist_ok=True)
def make_record(self, stats):
assert "epoch" in stats
if self._best_record is not None:
del self._best_record.state_dict
del self._best_record
crit_key = self.early_stop_criterion.lstrip("~")
if crit_key not in stats:
raise KeyError(f"not a valid criterion: {crit_key}; "
f"available criteria: {tuple(stats.keys())}")
self._best_record = Record(
state_dict=self.state_dict(),
criterion=stats[crit_key].item(),
epoch_idx=stats["epoch"].item(),
summary={k: v.cpu().detach() for k, v in stats.items()}
)
self._logger.info(f"new record found: "
f"{self._best_record.to_short_json()}")
utils.save_json(self._best_record.to_json(),
self.save_dir.joinpath("best-record.json"))
self.save_snapshot(self._best_record.state_dict, "best")
def state_dict(self):
return {k: v.cpu().detach().clone()
for k, v in self.model.state_dict().items()}
def check_early_stop(self, stats):
assert "epoch" in stats
if self._best_record is None:
self.make_record(stats)
return False
neg = self.early_stop_criterion.startswith("~")
crit_key = self.early_stop_criterion.lstrip("~")
if crit_key not in stats:
self._logger.warning(f"early stopping criterion {crit_key} not "
f"found in `stats` ({stats.keys()}); falling "
f"back to default value of 0")
crit = stats.get(crit_key, torch.tensor(0.0)).item()
if (crit > self._best_record.criterion) != neg:
self.make_record(stats)
return False
return (self.early_stop_patience is not None and
stats["epoch"] > (self._best_record.epoch_idx +
self.early_stop_patience))
def save_snapshot(self, state_dict, tag=None):
segments = ["checkpoint"]
if tag is not None:
segments.append(tag)
path = self.save_dir.joinpath("-".join(segments) + ".pth")
self._logger.info(f"saving snapshot to {path}...")
torch.save(state_dict, path)
def train(self, dataloader: td.DataLoader, val_dataloader: td.DataLoader
) -> Record:
stats = None
for eidx in range(1, self.num_epochs + 1):
stats = self(dataloader)
stats["epoch"] = torch.tensor(eidx)
if eidx % self.validate_every == 0:
with torch.no_grad():
fval_stats = self.fin_valid(val_dataloader)
with torch.no_grad():
samples, gval_stats = \
self.gen_valid(val_dataloader.dataset.data)
sample = random.choice(samples)
self.log_dialog("gval-input-sample", sample.input)
self.log_dialog("gval-gen-sample", sample.output)
with torch.no_grad():
samples, _ = self.gen_valid(dataloader.dataset.data, 3)
for i, sample in enumerate(samples, 1):
self.log_dialog(f"gtrain-input-sample-{i}", sample.input)
self.log_dialog(f"gtrain-gen-sample-{i}", sample.output)
val_stats = utils.merge_dict(fval_stats, gval_stats)
self.log_stats(f"e{eidx}-val-summary", val_stats, prefix="val")
stats.update({f"val-{k}": v for k, v in val_stats.items()})
if self.early_stop and self.check_early_stop(stats):
break
if self.save_every is not None and eidx % self.save_every == 0:
self.save_snapshot(self.state_dict(), f"e{eidx}")
if stats is not None and self._best_record is None:
self.make_record(stats)
if self.early_stop and self._best_record is not None:
self.model.load_state_dict(self._best_record.state_dict)
if self._best_record is not None:
self._logger.info(f"final summary: "
f"{pprint.pformat(self._best_record.to_json())}")
self.save_snapshot(self.state_dict(), "final")
return self._best_record
def train(args: TrainArguments) -> Record:
model, device = args.model, args.device
save_dir = args.save_dir
shell = utils.ShellUtils()
shell.mkdir(save_dir, silent=True)
utils.save_json(args.to_json(), str(save_dir.joinpath("args.json")))
logger = logging.getLogger("train")
processor = args.processor
vocabs: datasets.VocabSet = processor.vocabs
train_dataset = datasets.DialogDataset(
data=args.train_data,
processor=processor
)
valid_dataset = datasets.DialogDataset(
data=args.valid_data,
processor=processor
)
logger.info("preparing training environment...")
loss = create_loss(
model=model,
vocabs=vocabs,
kld_weight=args.kld_schedule,
enable_kl=not args.disable_kl,
kl_mode=args.kl_mode
)
if args.optimizer == "adam":
op_cls = op.Adam
else:
raise ValueError(f"unsupported optimizer: {args.optimizer}")
fval_cls = FinegrainedValidator
fval_kwg = dict(
model=model,
processor=processor,
device=device,
evaluators=list(filter(None, (
SpeakerEvaluator(vocabs.speaker),
DialogStateEvaluator(vocabs),
PosteriorEvaluator()
))),
report_every=None,
run_end_report=False,
progress_stat="loss",
loss=loss
)
if isinstance(model, models.VHDA):
@dataclass
class VHDAValidator(VHDAInferencer, fval_cls):
pass
fval_cls = VHDAValidator
fval_kwg.update(dict(
sample_scale=1.0
))
fval = fval_cls(**fval_kwg)
gval_cls = GenerativeValidator
gval_kwg = dict(
model=model,
processor=processor,
batch_size=args.valid_batch_size,
device=device,
evaluators=list(filter(None, [
DistinctEvaluator(vocabs),
SentLengthEvaluator(vocabs),
RougeEvaluator(vocabs),
DialogLengthEvaluator(),
WordEntropyEvaluator(train_dataset)
])),
report_every=None,
run_end_report=False,
beam_size=args.beam_size,
max_sent_len=args.max_gen_len
)
gval = gval_cls(**gval_kwg)
trainer_cls = Trainer
trainer_kwargs = dict(
model=model,
processor=processor,
device=device,
writer=torch.utils.tensorboard.SummaryWriter(
log_dir=str(args.save_dir)
),
evaluators=list(filter(None, (
SpeakerEvaluator(vocabs.speaker),
DialogStateEvaluator(vocabs)
))),
progress_stat="loss",
display_stats={"loss", "kld", "goal-acc-turn-user",
"rouge-l-f1", "conv-mi", "nll", "conv-len"},
report_every=args.report_every,
stats_formatter=utils.StatsFormatter(num_cols=3),
dialog_formatter=utils.DialogTableFormatter(
max_col_len=50
),
loss=loss,
optimizer_cls=functools.partial(
op_cls,
lr=args.learning_rate
),
grad_clip=args.gradient_clip,
l2norm=args.l2norm_weight,
save_dir=pathlib.Path(args.save_dir),
num_epochs=args.num_epochs,
fin_valid=fval,
gen_valid=gval,
validate_every=args.validate_every,
early_stop=args.early_stop,
early_stop_criterion=args.early_stop_criterion,
early_stop_patience=args.early_stop_patience,
save_every=args.save_every
)
if isinstance(model, models.VHDA):
@dataclass
class VHDATrainer(VHDAInferencer, trainer_cls):
pass
trainer_cls = VHDATrainer
trainer_kwargs.update(dict(
dropout_scale=args.dropout_schedule
))
trainer = trainer_cls(**trainer_kwargs)
train_dataloader = datasets.create_dataloader(
train_dataset,
batch_size=args.batch_size,
shuffle=True,
pin_memory=True,
drop_last=False
)
valid_dataloader = datasets.create_dataloader(
valid_dataset,
batch_size=args.valid_batch_size,
shuffle=False,
pin_memory=True,
drop_last=False
)
logger.info("commencing training...")
record = trainer.train(train_dataloader, valid_dataloader)
logger.info(f"final summary: {pprint.pformat(record.to_short_json())}")
logger.info("done!")
return record
def create_parser():
parser = yaap.Yaap()
# data options
parser.add_pth("data-dir", is_dir=True, must_exist=True,
default=(pathlib.Path(__file__).absolute().parent
.joinpath("tests/data/json")),
help="Path to the data dir. Must contain 'train.json' and "
"'dev.json'.")
# model options
parser.add_pth("model-path", must_exist=True,
default=(pathlib.Path(__file__).absolute().parent
.joinpath("configs/vhda-mini.yml")),
help="Path to the model configuration file.")
parser.add_int("gpu", min_bound=0,
help="GPU device to use. (e.g. 0, 1, etc.)")
# display options
parser.add_pth("logging-config", must_exist=True,
default=(pathlib.Path(__file__).absolute().parent
.joinpath("configs/logging.yml")),
help="Path to a logging config file (yaml/json).")
parser.add_pth("save-dir", default="out", is_dir=True,
help="Directory to save output files.")
parser.add_bol("overwrite", help="Whether to overwrite save dir.")
parser.add_int("report-every",
help="Report training statistics every N steps.")
# training options
parser.add_int("batch-size", default=32,
help="Mini-batch size.")
parser.add_int("valid-batch-size", default=32,
help="Mini-batch sizes for validation inference.")
parser.add_str("optimizer", default="adam", choices=("adam",),
help="Optimizer to use.")
parser.add_flt("gradient-clip",
help="Clip gradients by norm size.")
parser.add_flt("l2norm-weight",
help="Weight of l2-norm regularization.")
parser.add_flt("learning-rate", default=0.001, min_bound=0,
help="Optimizer learning rate.")
parser.add_int("epochs", default=10, min_bound=1,
help="Number of epochs to train for.")
parser.add_str("kld-schedule",
help="KLD w schedule given as a list of data points. Each "
"data point is a pair of training step and target "
"dropout scale. Steps in-between data points will be "
"interpolated. e.g. '[(0, 1.0), (10000, 0.1)]'")
parser.add_str("dropout-schedule",
help="Dropout schedule given as a list of data points. Each "
"data point is a pair of training step and target "
"dropout scale. Steps in-between data points will be "
"interpolated. e.g. '[(0, 1.0), (10000, 0.1)]'")
parser.add_flt("validate-every", default=1,
help="Number of epochs in-between validations.")
parser.add_bol("early-stop",
help="Whether to enable early-stopping.")
parser.add_str("early-stop-criterion", default="~loss",
help="The training statistics key to use as criterion "
"for early-stopping. Prefix with '~' to denote "
"negation during comparison.")
parser.add_int("early-stop-patience",
help="Number of epochs to wait without breaking "
"records until executing early-stopping. "
"defaults to infinity.")
parser.add_int("save-every",
help="Number of epochs to wait until saving a model "
"checkpoint.")
# model specific settings
parser.add_bol("disable-kl",
help="Whether to disable kl-divergence term.")
parser.add_str("kl-mode", default="kl-mi",
help="KL mode: one of kl, kl-mi, kl-mi+.")
parser.add_int("seed", help="Random seed.")
return parser
def main():
args = utils.parse_args(create_parser())
if args.logging_config is not None:
logging.config.dictConfig(utils.load_yaml(args.logging_config))
save_dir = pathlib.Path(args.save_dir)
if (not args.overwrite and
save_dir.exists() and utils.has_element(save_dir.glob("*.json"))):
raise FileExistsError(f"save directory ({save_dir}) is not empty")
shell = utils.ShellUtils()
shell.mkdir(save_dir, silent=True)
logger = logging.getLogger("train")
utils.seed(args.seed)
logger.info("loading data...")
load_fn = utils.chain_func(
lambda data: list(map(Dialog.from_json, data)),
utils.load_json
)
data_dir = pathlib.Path(args.data_dir)
train_data = load_fn(str(data_dir.joinpath("train.json")))
valid_data = load_fn(str(data_dir.joinpath("dev.json")))
processor = datasets.DialogProcessor(
sent_processor=datasets.SentProcessor(
bos=True,
eos=True,
lowercase=True,
tokenizer="space",
max_len=30
),
boc=True,
eoc=True,
state_order="randomized",
max_len=30
)
processor.prepare_vocabs(list(itertools.chain(train_data, valid_data)))
utils.save_pickle(processor, save_dir.joinpath("processor.pkl"))
logger.info("preparing model...")
utils.save_json(utils.load_yaml(args.model_path),
save_dir.joinpath("model.json"))
torchmodels.register_packages(models)
model_cls = torchmodels.create_model_cls(models, args.model_path)
model: models.AbstractTDA = model_cls(processor.vocabs)
model.reset_parameters()
utils.report_model(logger, model)
device = torch.device("cpu")
if args.gpu is not None:
device = torch.device(f"cuda:{args.gpu}")
model = model.to(device)
def create_scheduler(s):
return utils.PiecewiseScheduler([utils.Coordinate(*t) for t in eval(s)])
train_args = TrainArguments(
model=model,
train_data=tuple(train_data),
valid_data=tuple(valid_data),
processor=processor,
device=device,
save_dir=save_dir,
report_every=args.report_every,
batch_size=args.batch_size,
valid_batch_size=args.valid_batch_size,
optimizer=args.optimizer,
gradient_clip=args.gradient_clip,
l2norm_weight=args.l2norm_weight,
learning_rate=args.learning_rate,
num_epochs=args.epochs,
kld_schedule=(utils.ConstantScheduler(1.0)
if args.kld_schedule is None else
create_scheduler(args.kld_schedule)),
dropout_schedule=(utils.ConstantScheduler(1.0)
if args.dropout_schedule is None else
create_scheduler(args.dropout_schedule)),
validate_every=args.validate_every,
early_stop=args.early_stop,
early_stop_criterion=args.early_stop_criterion,
early_stop_patience=args.early_stop_patience,
disable_kl=args.disable_kl,
kl_mode=args.kl_mode,
save_every=args.save_every
)
utils.save_json(train_args.to_json(), save_dir.joinpath("args.json"))
record = train(train_args)
utils.save_json(record.to_json(), save_dir.joinpath("final-summary.json"))
if __name__ == "__main__":
with torch.autograd.detect_anomaly():
main()