minigpt4

mini_gpt4.py

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+"""
+ Copyright (c) 2023, salesforce.com, inc.
+ All rights reserved.
+ SPDX-License-Identifier: BSD-3-Clause
+ For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/BSD-3-Clause
+"""
+import logging
+import random
+import os
+import torch
+from torch.cuda.amp import autocast as autocast
+import torch.nn as nn
+
+from minigpt4.common.registry import registry
+from minigpt4.models.blip2 import Blip2Base, disabled_train
+from minigpt4.models.modeling_llama import LlamaForCausalLM
+from transformers import LlamaTokenizer
+
+
+@registry.register_model("mini_gpt4")
+class MiniGPT4(Blip2Base):
+    """
+    BLIP2 GPT-LLAMA model.
+    """
+
+    PRETRAINED_MODEL_CONFIG_DICT = {
+        "pretrain_vicuna": "configs/models/minigpt4.yaml",
+    }
+
+    def __init__(
+        self,
+        vit_model="eva_clip_g",
+        q_former_model="https://storage.googleapis.com/sfr-vision-language-research/LAVIS/models/BLIP2/blip2_pretrained_flant5xxl.pth",
+        img_size=224,
+        drop_path_rate=0,
+        use_grad_checkpoint=False,
+        vit_precision="fp16",
+        freeze_vit=True,
+        freeze_qformer=True,
+        num_query_token=32,
+        llama_model="",
+        llama_cache_dir='',
+        prompt_path="",
+        prompt_template="",
+        max_txt_len=32,
+        end_sym='\n',
+    ):
+        super().__init__()
+
+        self.tokenizer = self.init_tokenizer()
+
+        print('Loading VIT')
+        self.visual_encoder, self.ln_vision = self.init_vision_encoder(
+            vit_model, img_size, drop_path_rate, use_grad_checkpoint, vit_precision
+        )
+        if freeze_vit:
+            for name, param in self.visual_encoder.named_parameters():
+                param.requires_grad = False
+            self.visual_encoder = self.visual_encoder.eval()
+            self.visual_encoder.train = disabled_train
+            for name, param in self.ln_vision.named_parameters():
+                param.requires_grad = False
+            self.ln_vision = self.ln_vision.eval()
+            self.ln_vision.train = disabled_train
+            logging.info("freeze vision encoder")
+        print('Loading VIT Done')
+
+        print('Loading Q-Former')
+        self.Qformer, self.query_tokens = self.init_Qformer(
+            num_query_token, self.visual_encoder.num_features
+        )
+        self.Qformer.cls = None
+        self.Qformer.bert.embeddings.word_embeddings = None
+        self.Qformer.bert.embeddings.position_embeddings = None
+        for layer in self.Qformer.bert.encoder.layer:
+            layer.output = None
+            layer.intermediate = None
+        self.load_from_pretrained(url_or_filename=q_former_model)
+
+        if freeze_qformer:
+            for name, param in self.Qformer.named_parameters():
+                param.requires_grad = False
+            self.Qformer = self.Qformer.eval()
+            self.Qformer.train = disabled_train
+            self.query_tokens.requires_grad = False
+            logging.info("freeze Qformer")
+        print('Loading Q-Former Done')
+
+        print('Loading LLAMA')
+        self.llama_tokenizer = LlamaTokenizer.from_pretrained('camenduru/MiniGPT4', use_fast=False)
+        self.llama_tokenizer.pad_token = self.llama_tokenizer.eos_token
+
+        if llama_cache_dir:
+            self.llama_model = LlamaForCausalLM.from_pretrained(
+                'camenduru/MiniGPT4', load_in_8bit=True, torch_dtype=torch.float16, device_map="auto"
+            )
+        else:
+            self.llama_model = LlamaForCausalLM.from_pretrained(
+                'camenduru/MiniGPT4', load_in_8bit=True, torch_dtype=torch.float16, device_map="auto"
+            )
+        for name, param in self.llama_model.named_parameters():
+            param.requires_grad = False
+        print('Loading LLAMA Done')
+
+        self.llama_proj = nn.Linear(
+            self.Qformer.config.hidden_size, self.llama_model.config.hidden_size
+        )
+        self.max_txt_len = max_txt_len
+        self.end_sym = end_sym
+
+        if prompt_path:
+            with open(prompt_path, 'r') as f:
+                raw_prompts = f.read().splitlines()
+            filted_prompts = [raw_prompt for raw_prompt in raw_prompts if "<ImageHere>" in raw_prompt]
+            self.prompt_list = [prompt_template.format(p) for p in filted_prompts]
+            print('Load {} training prompts'.format(len(self.prompt_list)))
+            print('Prompt Example \n{}'.format(random.choice(self.prompt_list)))
+        else:
+            self.prompt_list = []
+
+    def vit_to_cpu(self):
+        self.ln_vision.to("cpu")
+        self.ln_vision.float()
+        self.visual_encoder.to("cpu")
+        self.visual_encoder.float()
+    
+    def encode_img(self, image):
+        device = image.device
+        self.vit_to_cpu()
+        image = image.to("cpu")
+        with self.maybe_autocast():
+            image_embeds = self.ln_vision(self.visual_encoder(image)).to(device)
+            image_atts = torch.ones(image_embeds.size()[:-1], dtype=torch.long).to(device)
+
+            query_tokens = self.query_tokens.expand(image_embeds.shape[0], -1, -1)
+            query_output = self.Qformer.bert(
+                query_embeds=query_tokens,
+                encoder_hidden_states=image_embeds,
+                encoder_attention_mask=image_atts,
+                return_dict=True,
+            )
+
+            inputs_llama = self.llama_proj(query_output.last_hidden_state)
+            atts_llama = torch.ones(inputs_llama.size()[:-1], dtype=torch.long).to(image.device)
+        return inputs_llama, atts_llama
+
+    def prompt_wrap(self, img_embeds, atts_img, prompt):
+        if prompt:
+            batch_size = img_embeds.shape[0]
+            p_before, p_after = prompt.split('<ImageHere>')
+            p_before_tokens = self.llama_tokenizer(
+                p_before, return_tensors="pt", add_special_tokens=False).to(img_embeds.device)
+            p_after_tokens = self.llama_tokenizer(
+                p_after, return_tensors="pt", add_special_tokens=False).to(img_embeds.device)
+            p_before_embeds = self.llama_model.model.embed_tokens(p_before_tokens.input_ids).expand(batch_size, -1, -1)
+            p_after_embeds = self.llama_model.model.embed_tokens(p_after_tokens.input_ids).expand(batch_size, -1, -1)
+            wrapped_img_embeds = torch.cat([p_before_embeds, img_embeds, p_after_embeds], dim=1)
+            wrapped_atts_img = atts_img[:, :1].expand(-1, wrapped_img_embeds.shape[1])
+            return wrapped_img_embeds, wrapped_atts_img
+        else:
+            return img_embeds, atts_img
+
+    def forward(self, samples):
+        image = samples["image"]
+        img_embeds, atts_img = self.encode_img(image)
+        if hasattr(samples, 'question_split'):  # VQA dataset
+            print('VQA Batch')
+            vqa_prompt = '###Human: <Img><ImageHere></Img> '
+            img_embeds, atts_img = self.prompt_wrap(img_embeds, atts_img, vqa_prompt)
+        elif self.prompt_list:
+            prompt = random.choice(self.prompt_list)
+            img_embeds, atts_img = self.prompt_wrap(img_embeds, atts_img, prompt)
+
+        self.llama_tokenizer.padding_side = "right"
+
+        text = [t + self.end_sym for t in samples["text_input"]]
+
+        to_regress_tokens = self.llama_tokenizer(
+            text,
+            return_tensors="pt",
+            padding="longest",
+            truncation=True,
+            max_length=self.max_txt_len,
+            add_special_tokens=False
+        ).to(image.device)
+
+        targets = to_regress_tokens.input_ids.masked_fill(
+            to_regress_tokens.input_ids == self.llama_tokenizer.pad_token_id, -100
+        )
+
+        empty_targets = (
+            torch.ones([atts_img.shape[0], atts_img.shape[1]+1],
+                       dtype=torch.long).to(image.device).fill_(-100)  # plus one for bos
+        )
+        targets = torch.cat([empty_targets, targets], dim=1)
+
+        batch_size = img_embeds.shape[0]
+        bos = torch.ones([batch_size, 1],
+                         dtype=to_regress_tokens.input_ids.dtype,
+                         device=to_regress_tokens.input_ids.device) * self.llama_tokenizer.bos_token_id
+        bos_embeds = self.llama_model.model.embed_tokens(bos)
+        atts_bos = atts_img[:, :1]
+
+        to_regress_embeds = self.llama_model.model.embed_tokens(to_regress_tokens.input_ids)
+        inputs_embeds = torch.cat([bos_embeds, img_embeds, to_regress_embeds], dim=1)
+        attention_mask = torch.cat([atts_bos, atts_img, to_regress_tokens.attention_mask], dim=1)
+
+        with self.maybe_autocast():
+            outputs = self.llama_model(
+                inputs_embeds=inputs_embeds,
+                attention_mask=attention_mask,
+                return_dict=True,
+                labels=targets,
+            )
+        loss = outputs.loss
+
+        return {"loss": loss}
+
+    @classmethod
+    def from_config(cls, cfg):
+        vit_model = cfg.get("vit_model", "eva_clip_g")
+        q_former_model = cfg.get("q_former_model", "https://storage.googleapis.com/sfr-vision-language-research/LAVIS/models/BLIP2/blip2_pretrained_flant5xxl.pth")
+        img_size = cfg.get("image_size")
+        num_query_token = cfg.get("num_query_token")
+        llama_model = cfg.get("llama_model")
+
+        drop_path_rate = cfg.get("drop_path_rate", 0)
+        use_grad_checkpoint = cfg.get("use_grad_checkpoint", False)
+        vit_precision = cfg.get("vit_precision", "fp16")
+        freeze_vit = cfg.get("freeze_vit", True)
+        freeze_qformer = cfg.get("freeze_qformer", True)
+        llama_cache_dir = cfg.get("llama_cache_dir", "")
+
+        prompt_path = cfg.get("prompt_path", "")
+        prompt_template = cfg.get("prompt_template", "")
+        max_txt_len = cfg.get("max_txt_len", 32)
+        end_sym = cfg.get("end_sym", '\n')
+
+        model = cls(
+            vit_model=vit_model,
+            q_former_model=q_former_model,
+            img_size=img_size,
+            drop_path_rate=drop_path_rate,
+            use_grad_checkpoint=use_grad_checkpoint,
+            vit_precision=vit_precision,
+            freeze_vit=freeze_vit,
+            freeze_qformer=freeze_qformer,
+            llama_cache_dir=llama_cache_dir,
+            num_query_token=num_query_token,
+            llama_model=llama_model,
+            prompt_path=prompt_path,
+            prompt_template=prompt_template,
+            max_txt_len=max_txt_len,
+            end_sym=end_sym
+        )
+
+        ckpt_path = cfg.get("ckpt", "")  # load weights of MiniGPT-4
+        if ckpt_path:
+            print("Load BLIP2-LLM Checkpoint: {}".format(ckpt_path))
+            ckpt = torch.load(ckpt_path, map_location="cpu")
+            msg = model.load_state_dict(ckpt['model'], strict=False)
+
+        return model