Apply changes from cekal/mpt-7b-peft-compatible

README.md

@@ -14,6 +14,12 @@ datasets:
 inference: false
 ---
 
+### Attribution
+
+This model is derived from [MosaicML's MPT-30B model](https://huggingface.co/mosaicml/mpt-30b/tree/main), with changes from
+[cekal/mpt-7b-peft-compatible](https://huggingface.co/cekal/mpt-7b-peft-compatible) applied; each licensed under the
+Apache License, version 2.0.
+
 # MPT-30B
 
 MPT-30B is a decoder-style transformer pretrained from scratch on 1T tokens of English text and code.

modeling_mpt.py

@@ -28,13 +28,19 @@ Tokenizer = Union[PreTrainedTokenizer, PreTrainedTokenizerFast]
 class MPTPreTrainedModel(PreTrainedModel):
     config_class = MPTConfig
     base_model_prefix = 'model'
-    _no_split_modules = ['MPTBlock']
+    _no_split_modules = ["MPTBlock"]
+    supports_gradient_checkpointing = True
+
+    def _set_gradient_checkpointing(self, module, value=False):
+        if isinstance(module, MPTModel):
+            module.gradient_checkpointing = value
 
 class MPTModel(MPTPreTrainedModel):
 
     def __init__(self, config: MPTConfig):
         config._validate_config()
         super().__init__(config)
+        self.gradient_checkpointing = False
         self.attn_impl = config.attn_config['attn_impl']
         self.prefix_lm = config.attn_config['prefix_lm']
         self.attn_uses_sequence_id = config.attn_config['attn_uses_sequence_id']
@@ -143,8 +149,37 @@ class MPTModel(MPTPreTrainedModel):
     def forward(self, input_ids: torch.LongTensor, past_key_values: Optional[List[Tuple[torch.FloatTensor]]]=None, attention_mask: Optional[torch.ByteTensor]=None, prefix_mask: Optional[torch.ByteTensor]=None, sequence_id: Optional[torch.LongTensor]=None, return_dict: Optional[bool]=None, output_attentions: Optional[bool]=None, output_hidden_states: Optional[bool]=None, use_cache: Optional[bool]=None, inputs_embeds: Optional[torch.Tensor]=None):
         return_dict = return_dict if return_dict is not None else self.config.return_dict
         use_cache = use_cache if use_cache is not None else self.config.use_cache
+        if self.gradient_checkpointing and self.training:
+            if use_cache:
+                use_cache = False
+        if input_ids is not None and inputs_embeds is not None:
+            raise ValueError("You cannot specify both decoder_input_ids and decoder_inputs_embeds at the same time")
+        elif input_ids is not None:
+            batch_size, seq_length = input_ids.shape
+        elif inputs_embeds is not None:
+            batch_size, seq_length, _ = inputs_embeds.shape
+        else:
+            raise ValueError("You have to specify either decoder_input_ids or decoder_inputs_embeds")
+
+        seq_length_with_past = seq_length
+        past_key_values_length = 0
+
+        if past_key_values is not None:
+            past_key_values_length = past_key_values[0][0].shape[2]
+            seq_length_with_past = seq_length_with_past + past_key_values_length
+
         if attention_mask is not None:
             attention_mask = attention_mask.bool()
+        else:
+            attention_mask = torch.ones(
+                (batch_size, seq_length_with_past), dtype=torch.bool, device=inputs_embeds.device
+            )
+
+        if inputs_embeds is None:
+            tok_emb = self.wte(input_ids)
+        else:
+            tok_emb = inputs_embeds
+
         if prefix_mask is not None:
             prefix_mask = prefix_mask.bool()
         if not return_dict:
@@ -152,8 +187,8 @@ class MPTModel(MPTPreTrainedModel):
         if output_attentions:
             if self.attn_impl != 'torch':
                 raise NotImplementedError('output_attentions is not implemented for MPT when using attn_impl `flash` or `triton`.')
-        if attention_mask is not None and attention_mask[:, 0].sum() != attention_mask.shape[0] and self.training:
-            raise NotImplementedError('MPT does not support training with left padding.')
+        # if attention_mask is not None and attention_mask[:, 0].sum() != attention_mask.shape[0] and self.training:
+        #     raise NotImplementedError('MPT does not support training with left padding.')
         if self.prefix_lm and prefix_mask is None:
             raise ValueError('prefix_mask is a required argument when MPT is configured with prefix_lm=True.')
         if inputs_embeds is not None:
@@ -163,7 +198,7 @@ class MPTModel(MPTPreTrainedModel):
                 raise ValueError('sequence_id is a required argument when MPT is configured with attn_uses_sequence_id=True ' + 'and the model is in train mode.')
             elif self.attn_uses_sequence_id is False and sequence_id is not None:
                 warnings.warn('MPT received non-None input for `sequence_id` but is configured with attn_uses_sequence_id=False. ' + 'This input will be ignored. If you want the model to use `sequence_id`, set attn_uses_sequence_id to True.')
-        S = input_ids.size(1)
+        S = seq_length
         assert S <= self.config.max_seq_len, f'Cannot forward input with seq_len={S}, this model only supports seq_len<={self.config.max_seq_len}'
         tok_emb = self.wte(input_ids)
         if self.alibi:
@@ -179,7 +214,7 @@ class MPTModel(MPTPreTrainedModel):
             if S + past_position > self.config.max_seq_len:
                 raise ValueError(f'Cannot forward input with past sequence length {past_position} and current sequence length {S + 1}, this model only supports total sequence length <= {self.config.max_seq_len}.')
             pos = torch.arange(past_position, S + past_position, dtype=torch.long, device=input_ids.device).unsqueeze(0)
-            if attention_mask is not None:
+            if attention_mask is not None and not self.training:
                 pos = torch.clamp(pos - torch.cumsum((~attention_mask).to(torch.int32), dim=1)[:, past_position:], min=0)
             pos_emb = self.wpe(pos)
             x = tok_emb + pos_emb
@@ -199,7 +234,26 @@ class MPTModel(MPTPreTrainedModel):
                 assert all_hidden_states is not None
                 all_hidden_states = all_hidden_states + (x,)
             past_key_value = past_key_values[b_idx] if past_key_values is not None else None
-            (x, attn_weights, past_key_value) = block(x, past_key_value=past_key_value, attn_bias=attn_bias, attention_mask=attention_mask, is_causal=self.is_causal)
+            if self.gradient_checkpointing and self.training:
+
+                def create_custom_forward(module):
+                    def custom_forward(*inputs):
+                        # None for past_key_value
+                        return module(*inputs)
+
+                    return custom_forward
+
+                (x, attn_weights, past_key_value) = torch.utils.checkpoint.checkpoint(
+                    create_custom_forward(block),
+                    x,
+                    past_key_value,
+                    attn_bias,
+                    attention_mask,
+                    self.is_causal,
+                )
+            else:
+                (x, attn_weights, past_key_value) = block(x, past_key_value=past_key_value, attn_bias=attn_bias, attention_mask=attention_mask, is_causal=self.is_causal)
+
             if past_key_values is not None:
                 past_key_values[b_idx] = past_key_value
             if output_attentions: