140 lines
5.1 KiB
Python
140 lines
5.1 KiB
Python
# Copyright 2023 Haotian Liu
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import List, Optional, Tuple, Union
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import torch
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import torch.nn as nn
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from torch.nn import CrossEntropyLoss
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from transformers import AutoConfig, AutoModelForCausalLM, \
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LlamaConfig, LlamaModel, LlamaForCausalLM
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from transformers.modeling_outputs import CausalLMOutputWithPast
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from ..llava_arch import LlavaMetaModel, LlavaMetaForCausalLM
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class LlavaConfig(LlamaConfig):
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model_type = "llava"
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class LlavaLlamaModel(LlavaMetaModel, LlamaModel):
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config_class = LlavaConfig
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def __init__(self, config: LlamaConfig):
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super(LlavaLlamaModel, self).__init__(config)
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class LlavaLlamaForCausalLM(LlamaForCausalLM, LlavaMetaForCausalLM):
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config_class = LlavaConfig
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def __init__(self, config):
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super(LlamaForCausalLM, self).__init__(config)
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self.model = LlavaLlamaModel(config)
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self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)
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# Initialize weights and apply final processing
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self.post_init()
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def get_model(self):
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return self.model
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def forward(
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self,
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input_ids: torch.LongTensor = None,
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attention_mask: Optional[torch.Tensor] = None,
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past_key_values: Optional[List[torch.FloatTensor]] = None,
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inputs_embeds: Optional[torch.FloatTensor] = None,
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labels: Optional[torch.LongTensor] = None,
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use_cache: Optional[bool] = None,
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output_attentions: Optional[bool] = None,
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output_hidden_states: Optional[bool] = None,
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images: Optional[torch.FloatTensor] = None,
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return_dict: Optional[bool] = None,
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) -> Union[Tuple, CausalLMOutputWithPast]:
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output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
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output_hidden_states = (
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output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
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)
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return_dict = return_dict if return_dict is not None else self.config.use_return_dict
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input_ids, attention_mask, past_key_values, inputs_embeds, labels = self.prepare_inputs_labels_for_multimodal(input_ids, attention_mask, past_key_values, labels, images)
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# decoder outputs consists of (dec_features, layer_state, dec_hidden, dec_attn)
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outputs = self.model(
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input_ids=input_ids,
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attention_mask=attention_mask,
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past_key_values=past_key_values,
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inputs_embeds=inputs_embeds,
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use_cache=use_cache,
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output_attentions=output_attentions,
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output_hidden_states=output_hidden_states,
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return_dict=return_dict
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)
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hidden_states = outputs[0]
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logits = self.lm_head(hidden_states)
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loss = None
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if labels is not None:
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# Shift so that tokens < n predict n
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shift_logits = logits[..., :-1, :].contiguous()
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shift_labels = labels[..., 1:].contiguous()
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# Flatten the tokens
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loss_fct = CrossEntropyLoss()
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shift_logits = shift_logits.view(-1, self.config.vocab_size)
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shift_labels = shift_labels.view(-1)
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# Enable model/pipeline parallelism
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shift_labels = shift_labels.to(shift_logits.device)
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loss = loss_fct(shift_logits, shift_labels)
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if not return_dict:
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output = (logits,) + outputs[1:]
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return (loss,) + output if loss is not None else output
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return CausalLMOutputWithPast(
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loss=loss,
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logits=logits,
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past_key_values=outputs.past_key_values,
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hidden_states=outputs.hidden_states,
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attentions=outputs.attentions,
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)
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def prepare_inputs_for_generation(
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self, input_ids, past_key_values=None, attention_mask=None, inputs_embeds=None, **kwargs
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):
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if past_key_values:
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input_ids = input_ids[:, -1:]
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# if `inputs_embeds` are passed, we only want to use them in the 1st generation step
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if inputs_embeds is not None and past_key_values is None:
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model_inputs = {"inputs_embeds": inputs_embeds}
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else:
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model_inputs = {"input_ids": input_ids}
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model_inputs.update(
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{
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"past_key_values": past_key_values,
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"use_cache": kwargs.get("use_cache"),
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"attention_mask": attention_mask,
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"images": kwargs.get("images", None),
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}
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)
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return model_inputs
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AutoConfig.register("llava", LlavaConfig)
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AutoModelForCausalLM.register(LlavaConfig, LlavaLlamaForCausalLM)
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