wehub-resource-sync
63 lines
2.6 KiB
Python
63 lines
2.6 KiB
Python
# Copyright (c) ModelScope Contributors. All rights reserved.
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import torch.nn
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import torch.nn.functional as F
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from functools import partial
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from swift.loss import loss_map
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from swift.metrics import eval_metrics_map
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from swift.utils import get_logger
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from .base import BaseMegatronTrainer
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logger = get_logger()
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class MegatronEmbeddingTrainer(BaseMegatronTrainer):
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def __init__(self, args, template):
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super().__init__(args, template)
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self._loss_func = loss_map[args.loss_type](args, self)
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eval_metric = 'infonce' if args.loss_type == 'infonce' else 'paired'
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self.eval_metrics = eval_metrics_map[eval_metric](args, self)
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def loss_func(self,
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output_tensor: torch.Tensor,
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*,
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labels: torch.Tensor,
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packed_seq_params=None,
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attention_mask=None):
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training = self.unwrapped_models[0].training
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last_hidden_state = self.get_last_tokens(output_tensor, packed_seq_params, attention_mask)
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if not training:
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self.eval_metrics.update(last_hidden_state.detach(), labels)
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mrl_dims = self.args.mrl_dims
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if mrl_dims:
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# Matryoshka Representation Learning: compute loss on each truncated dimension
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# and aggregate with the corresponding weights.
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loss = None
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for dim, weight in mrl_dims.items():
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if dim > last_hidden_state.shape[-1]:
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logger.warning_once(f'MRL: skipping dimension {dim} because it exceeds the model hidden size '
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f'({last_hidden_state.shape[-1]}).')
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continue
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sliced = F.normalize(last_hidden_state[..., :dim], p=2, dim=-1)
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cur_loss = weight * self._loss_func({'last_hidden_state': sliced}, labels)
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loss = cur_loss if loss is None else loss + cur_loss
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else:
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loss = self._loss_func({'last_hidden_state': last_hidden_state}, labels)
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metric = {'loss': loss.detach().clone()}
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metric = self._all_reduce_metric(metric)
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return loss, metric
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def forward_step(self, data_iterator, model):
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vp_stage = model.module.module.vp_stage
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data = self.get_batch(data_iterator, vp_stage)
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labels = data.pop('labels', None)
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output_tensor = model(**data)
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loss_func = partial(
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self.loss_func,
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labels=labels,
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packed_seq_params=data.get('packed_seq_params'),
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attention_mask=data.get('attention_mask')
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if data.get('attention_mask') is not None else data.get('attention_mask_2d'))
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return output_tensor, loss_func
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