98 lines
3.6 KiB
Python
98 lines
3.6 KiB
Python
from functools import cache
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from typing import Dict, Optional
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import pytorch_lightning as pl
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import torch
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import torchmetrics
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from modeling_wit import QWenLMHeadModel
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from wit.configuration import ModelConfig
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from transformers import AutoConfig
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class LitModule(pl.LightningModule):
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def __init__(
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self,
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pretrained_model_dir: str = None,
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learning_rate: float = 0.0001,
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config: ModelConfig = None,
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use_tril_attention_mask: str = False,
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):
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super().__init__()
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self.save_hyperparameters()
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if config == None:
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config = ModelConfig()
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model = QWenLMHeadModel(config)
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if pretrained_model_dir != None:
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from modelscope import snapshot_download
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model = model.from_pretrained(snapshot_download(pretrained_model_dir))
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self.llm = self.register_core_module(model)
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self.learning_rate = learning_rate
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self.use_tril_attention_mask = use_tril_attention_mask
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self.metric_loss = torchmetrics.MeanMetric()
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self.vocab_size = self.llm.config.vocab_size
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self.metric_accuracy = torchmetrics.Accuracy(
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task="multiclass",
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num_classes=self.vocab_size,
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)
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@cache
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def get_batch_tril_matrix(self, block_size: int, batch_size: Optional[int] = None) -> torch.Tensor:
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matrix = torch.ones(block_size, block_size).tril()
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if batch_size is not None:
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matrix = matrix.repeat(batch_size, 1, 1)
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return matrix
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def register_core_module(self, module: torch.nn.Module) -> torch.nn.Module:
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object.__setattr__(self, "__core_module__", module)
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return module
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def training_step(self, batch: Dict[str, torch.Tensor], batch_idx):
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batch_size, block_size = batch["input_ids"].shape
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if self.use_tril_attention_mask:
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batch["attention_mask"] = self.get_batch_tril_matrix(block_size, batch_size=batch_size).to(self.device)
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outputs, loss = self.llm(**batch)
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self.log("train_loss", loss, rank_zero_only=True)
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return loss
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def validation_step(self, batch: Dict[str, torch.Tensor], batch_idx):
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outputs, loss = self.llm(**batch, return_dict=True)
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logits = outputs[..., :-1, :]
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logits = logits.contiguous().view(-1, logits.size(-1))
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labels = batch["labels"][..., 1:]
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labels = labels.contiguous().view(-1)
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label_mask = batch["mask"][..., 1:]
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label_mask = label_mask.contiguous().view(-1)
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logits_m = logits[label_mask]
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labels_m = labels[label_mask]
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self.metric_accuracy.update(logits_m, labels_m)
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self.metric_loss.update(loss)
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def on_validation_epoch_end(self) -> None:
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self.log("val_loss", self.metric_loss, rank_zero_only=True)
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self.log("accuracy", self.metric_accuracy, rank_zero_only=True)
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def configure_optimizers(self):
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optimizer = torch.optim.AdamW(self.trainer.model.parameters(), lr=self.learning_rate)
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return optimizer
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def configure_callbacks(self):
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checkpoint_callback = pl.callbacks.ModelCheckpoint(
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monitor="accuracy",
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mode="max",
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filename="{epoch:02d}-{accuracy:.4f}",
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)
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early_stop_callback = pl.callbacks.EarlyStopping(
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monitor="accuracy",
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min_delta=0.001,
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patience=3,
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mode="max",
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stopping_threshold=1,
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)
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lr_monitor = pl.callbacks.LearningRateMonitor(logging_interval="step")
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return [lr_monitor]
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# return [checkpoint_callback, lr_monitor]
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# return [checkpoint_callback, early_stop_callback]
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