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handle token/logprob shifting

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This commit is contained in:
Wing Lian
2024-12-30 11:21:19 -05:00
parent f60c623af0
commit fa055f9f69
2 changed files with 20 additions and 9 deletions
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27
src/axolotl/core/trainers/kd/__init__.py
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@@ -41,7 +41,12 @@ class AxolotlKDTrainer(AxolotlTrainer):
self._signature_columns += columns_to_add self._signature_columns += columns_to_add
def compute_loss( def compute_loss(
self, model, inputs, return_outputs=False, num_items_in_batch=None self,
model,
inputs,
return_outputs=False,
num_items_in_batch=None,
shift_targets=False,
): ):
""" """
How the loss is computed by Trainer. By default, all models return the loss in the first element. How the loss is computed by Trainer. By default, all models return the loss in the first element.
@@ -65,16 +70,22 @@ class AxolotlKDTrainer(AxolotlTrainer):
# FIXME: account for tokenizer.padding_side # FIXME: account for tokenizer.padding_side
student_logits = outputs["logits"][:, :seq_len, :].contiguous() student_logits = outputs["logits"][:, :seq_len, :].contiguous()
shift_logits = student_logits[..., :-1, :].contiguous() if shift_targets:
shift_target_logprobs = target_logprobs[..., 1:, :].contiguous() shift_logits = student_logits[..., :-1, :].contiguous()
shift_target_token_ids = target_token_ids[..., 1:, :].contiguous() target_logprobs_for_loss = target_logprobs[..., 1:, :].contiguous()
shift_target_mask = target_mask[..., 1:, :].contiguous() target_token_ids_for_loss = target_token_ids[..., 1:, :].contiguous()
target_mask_for_loss = target_mask[..., 1:, :].contiguous()
else:
shift_logits = student_logits.contiguous()
target_logprobs_for_loss = target_logprobs.contiguous()
target_token_ids_for_loss = target_token_ids.contiguous()
target_mask_for_loss = target_mask.contiguous()
loss_kd = topk_kd_loss( loss_kd = topk_kd_loss(
shift_logits, shift_logits,
shift_target_token_ids, target_token_ids_for_loss,
shift_target_logprobs, target_logprobs_for_loss,
shift_target_mask, target_mask_for_loss,
num_items_in_batch=num_items_in_batch, num_items_in_batch=num_items_in_batch,
kd_temperature=self.args.kd_temperature, kd_temperature=self.args.kd_temperature,
) )

2
src/axolotl/prompt_strategies/chat_template.py
View File

@@ -502,7 +502,7 @@ class ChatTemplateStrategyWithKD(ChatTemplateStrategy):
# fill with -inf for padding_len tokens for top_k tokens # fill with -inf for padding_len tokens for top_k tokens
# extend target_logprobs with a padding_len x top_k 2D list filled with -inf # extend target_logprobs with a padding_len x top_k 2D list filled with -inf
for _ in range(input_padding_len): for _ in range(1, input_padding_len): # start at 1 since this is causal
target_logprobs.append([-float("inf")] * top_k) target_logprobs.append([-float("inf")] * top_k)
target_token_ids.append(list(range(top_k))) target_token_ids.append(list(range(top_k)))
target_mask.append([0] * top_k) target_mask.append([0] * top_k)