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import copy
import os
import sys
dir_path = os.path.dirname(os.path.realpath(__file__))
sys.path.insert(0, dir_path)
import contextlib
import torch.utils.checkpoint
import torch.nn as nn
from torch.nn import LayerNorm
from torchvision import transforms
from torchvision.transforms.functional import InterpolationMode
from PIL import Image
from .modeling_vit import *
from .modeling_InternLM import *
from .modeling_utils import *
from .resampler import create_resampler
from transformers.utils import logging
logger = logging.get_logger(__name__)
class InternLMXComposerForCausalLM(PreTrainedModel):
config_class = InternLMXComposerConfig
_auto_class = "AutoModelForCausalLM"
gen_config = dict(
num_beams=5,
do_sample=True,
min_length=1,
repetition_penalty=1.5,
length_penalty=1.0,
temperature=1.0,
max_new_tokens=500,
)
def __init__(self, config):
super().__init__(config)
self.max_length = config.max_length
print (f'Set max length to {self.max_length}')
print('Init VIT ... ', end='')
self.visual_encoder = create_eva_vit_g(img_size=448)
self.ln_vision = nn.Identity()
self.supports_gradient_checkpointing = True
print('Done')
print('Init Perceive Sampler ... ', end='')
with all_logging_disabled():
self.Qformer = create_resampler(num_query_token=256)
print('Done')
print('Init InternLM ... ', end='')
self.flag_image_start = nn.Parameter(torch.zeros([1, 1, 4096]))
self.flag_image_end = nn.Parameter(torch.zeros([1, 1, 4096]))
self.flag_image_start.requires_grad = False
self.flag_image_end.requires_grad = False
if int(torch.__version__[0]) == 1:
self.internlm_model = InternLMForCausalLM._from_config(config).to(
torch.float16)
else:
assert int(torch.__version__[0]) == 2
# speed up init llm
with torch.device('meta'):
self.internlm_model = InternLMForCausalLM._from_config(config)
self.internlm_model.to_empty(device=config.device).to(torch.float16)
self.internlm_proj = nn.Linear(4096,
self.internlm_model.config.hidden_size)
print('Done')
self.vis_processor = transforms.Compose([
transforms.Resize((448, 448),
interpolation=InterpolationMode.BICUBIC),
transforms.ToTensor(),
transforms.Normalize((0.48145466, 0.4578275, 0.40821073),
(0.26862954, 0.26130258, 0.27577711)),
])
self.tokenizer = None
@property
def eoh(self):
return '<TOKENS_UNUSED_0>'
@property
def eoa(self):
return '<TOKENS_UNUSED_1>'
def get_input_embeddings(self):
return self.internlm_model.get_input_embeddings()
def _set_gradient_checkpointing(self, module, value=False):
if value:
self.internlm_model.apply(
partial(self.internlm_model._set_gradient_checkpointing, value=True)
)
def encode_img(self, image):
if image is None:
return None
if isinstance(image, str):
image = Image.open(image).convert("RGB")
image = self.vis_processor(image).unsqueeze(0).to(self.device)
else:
assert isinstance(image, torch.Tensor)
device = image.device
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_output = self.Qformer(image_embeds)
inputs_internlm = self.internlm_proj(query_output)
inputs_internlm = torch.cat([
self.flag_image_start.expand(inputs_internlm.shape[0], -1, -1),
inputs_internlm,
self.flag_image_end.expand(inputs_internlm.shape[0], -1, -1)
],
dim=1)
return inputs_internlm
def encode_text(self, text, add_special_tokens=False):
text_token_ids = self.tokenizer(
text,
return_tensors='pt',
add_special_tokens=add_special_tokens,
).input_ids.to(self.device)
text_embeds = self.internlm_model.model.embed_tokens(text_token_ids)
return text_embeds
def decode_text(self, out_embeds):
out_text = self.tokenizer.batch_decode(out_embeds,
skip_special_tokens=True)[0]
out_text = out_text.split(self.eoa)[0]
return out_text
def wrap_text(self, user_text, bot_text='', add_special=True):
if add_special:
eoh = self.eoh
else:
eoh = ''
text = f'<|User|>:{user_text}{eoh}\n<|Bot|>:{bot_text}'
return text
def get_gen_args(self, **kwargs):
new_kargs = copy.deepcopy(self.gen_config)
new_kargs.update(kwargs)
return new_kargs
def generate(self, text, image=None, **kwargs):
text_embeds = self.encode_text(text)
img_embeds = self.encode_img(image)
prompt_embeds = self.wrap_prompt(text_embeds, img_embeds)
out_embeds = self.internlm_model.generate(inputs_embeds=prompt_embeds,
**self.get_gen_args(**kwargs))
out_text = self.decode_text(out_embeds)
return out_text
def chat(self, text, image=None, history=None, **kwargs):
text_embeds = self.encode_text(text)
img_embeds = self.encode_img(image)
prompt_embeds = self.wrap_prompt(text_embeds,
img_embeds,
history=history)
out_embeds = self.internlm_model.generate(inputs_embeds=prompt_embeds,
**self.get_gen_args(**kwargs))
out_text = self.decode_text(out_embeds)
# trunc at eoh and eoa
clean_out_text_token_ids = self.tokenizer(
out_text, return_tensors='pt').input_ids.to(self.device)
clean_out_text_embeds = self.internlm_model.model.embed_tokens(
clean_out_text_token_ids)
clean_prompt_embeds = self.wrap_prompt(text_embeds,
img_embeds,
add_special=False)
cur_history = torch.cat([clean_prompt_embeds, clean_out_text_embeds],
dim=1)
if history is None:
history = []
history.append(cur_history)
return out_text, history
def wrap_prompt(self,
text_embeds,
img_embeds=None,
history=None,
add_special=True):
if add_special:
prompt_segs = ['<|User|>:', f'{self.eoh}\n<|Bot|>:']
else:
prompt_segs = ['<|User|>:', '<|Bot|>:'] # used in wrap history
prompt_seg_embeds = []
for i, seg in enumerate(prompt_segs):
if history is not None:
add_special_tokens = False
else:
add_special_tokens = i == 0
seg_embeds = self.encode_text(
seg, add_special_tokens=add_special_tokens)
prompt_seg_embeds.append(seg_embeds)
if img_embeds is None:
img_embeds = text_embeds.new_empty(text_embeds.size(0), 0,
text_embeds.size(-1))
prompt_seg_embeds = [
prompt_seg_embeds[0], img_embeds, text_embeds, prompt_seg_embeds[1]
]
prompt_embeds = torch.cat(prompt_seg_embeds, dim=1)
if history is not None:
prompt_embeds = torch.cat([*history, prompt_embeds], dim=1)
return prompt_embeds
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