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from typing import List, Dict, Optional, Tuple
from PIL import Image, ImageOps, ImageDraw, ImageFont
import torch
import torch.nn as nn
from torchvision import transforms
from transformers import TextStreamer
from transformers.tokenization_utils import PreTrainedTokenizer as T
from abc import ABC
import re
import numpy as np
def load_image(image_path):
try:
image = Image.open(image_path)
corrected_image = ImageOps.exif_transpose(image)
return corrected_image
except Exception as e:
print(f"error: {e}")
return None
def re_match(text):
pattern = r'(<\|ref\|>(.*?)<\|/ref\|><\|det\|>(.*?)<\|/det\|>)'
matches = re.findall(pattern, text, re.DOTALL)
# pattern1 = r'<\|ref\|>.*?<\|/ref\|>\n'
# new_text1 = re.sub(pattern1, '', text, flags=re.DOTALL)
mathes_image = []
mathes_other = []
for a_match in matches:
if '<|ref|>image<|/ref|>' in a_match[0]:
mathes_image.append(a_match[0])
else:
mathes_other.append(a_match[0])
return matches, mathes_image, mathes_other
def extract_coordinates_and_label(ref_text, image_width, image_height):
try:
label_type = ref_text[1]
cor_list = eval(ref_text[2])
except Exception as e:
print(e)
return None
return (label_type, cor_list)
def draw_bounding_boxes(image, refs, ouput_path):
image_width, image_height = image.size
img_draw = image.copy()
draw = ImageDraw.Draw(img_draw)
overlay = Image.new('RGBA', img_draw.size, (0, 0, 0, 0))
draw2 = ImageDraw.Draw(overlay)
font = ImageFont.load_default()
img_idx = 0
for i, ref in enumerate(refs):
try:
result = extract_coordinates_and_label(ref, image_width, image_height)
if result:
label_type, points_list = result
color = (np.random.randint(0, 200), np.random.randint(0, 200), np.random.randint(0, 255))
color_a = color + (20, )
for points in points_list:
x1, y1, x2, y2 = points
x1 = int(x1 / 999 * image_width)
y1 = int(y1 / 999 * image_height)
x2 = int(x2 / 999 * image_width)
y2 = int(y2 / 999 * image_height)
if label_type == 'image':
try:
cropped = image.crop((x1, y1, x2, y2))
cropped.save(f"{ouput_path}/images/{img_idx}.jpg")
except Exception as e:
print(e)
pass
img_idx += 1
try:
if label_type == 'title':
draw.rectangle([x1, y1, x2, y2], outline=color, width=4)
draw2.rectangle([x1, y1, x2, y2], fill=color_a, outline=(0, 0, 0, 0), width=1)
else:
draw.rectangle([x1, y1, x2, y2], outline=color, width=2)
draw2.rectangle([x1, y1, x2, y2], fill=color_a, outline=(0, 0, 0, 0), width=1)
text_x = x1
text_y = max(0, y1 - 15)
text_bbox = draw.textbbox((0, 0), label_type, font=font)
text_width = text_bbox[2] - text_bbox[0]
text_height = text_bbox[3] - text_bbox[1]
draw.rectangle([text_x, text_y, text_x + text_width, text_y + text_height],
fill=(255, 255, 255, 30))
draw.text((text_x, text_y), label_type, font=font, fill=color)
except:
pass
except:
continue
img_draw.paste(overlay, (0, 0), overlay)
return img_draw
def process_image_with_refs(image, ref_texts, output_path):
result_image = draw_bounding_boxes(image, ref_texts, output_path)
return result_image
def find_closest_aspect_ratio(aspect_ratio, target_ratios, width, height, image_size):
best_ratio_diff = float('inf')
best_ratio = (1, 1)
area = width * height
for ratio in target_ratios:
target_aspect_ratio = ratio[0] / ratio[1]
ratio_diff = abs(aspect_ratio - target_aspect_ratio)
if ratio_diff < best_ratio_diff:
best_ratio_diff = ratio_diff
best_ratio = ratio
elif ratio_diff == best_ratio_diff:
if area > 0.5 * image_size * image_size * ratio[0] * ratio[1]:
best_ratio = ratio
# print(f'width: {width}, height: {height}, best_ratio: {best_ratio}')
return best_ratio
def dynamic_preprocess(image, min_num=2, max_num=9, image_size=640, use_thumbnail=False):
orig_width, orig_height = image.size
aspect_ratio = orig_width / orig_height
# calculate the existing image aspect ratio
target_ratios = set((i, j) for n in range(min_num, max_num + 1) for i in range(1, n + 1) for j in range(1, n + 1) if i * j <= max_num and i * j >= min_num)
target_ratios = sorted(target_ratios, key=lambda x: x[0] * x[1])
# print(f"target_ratios: {target_ratios}")
target_aspect_ratio = find_closest_aspect_ratio(
aspect_ratio,
target_ratios,
orig_width,
orig_height,
image_size
)
# print(f"target_aspect_ratio: {target_aspect_ratio}")
# calculate the target width and height
target_width = image_size * target_aspect_ratio[0]
target_height = image_size * target_aspect_ratio[1]
blocks = target_aspect_ratio[0] * target_aspect_ratio[1]
# resize the image
resized_img = image.resize((target_width, target_height))
processed_images = []
for i in range(blocks):
box = (
(i % (target_width // image_size)) * image_size,
(i // (target_width // image_size)) * image_size,
((i % (target_width // image_size)) + 1) * image_size,
((i // (target_width // image_size)) + 1) * image_size
)
# split the image
split_img = resized_img.crop(box)
processed_images.append(split_img)
assert len(processed_images) == blocks
# print(f"Number of processed images: {len(processed_images)}, Blocks: {blocks}")
if use_thumbnail and len(processed_images) != 1:
thumbnail_img = image.resize((image_size, image_size))
processed_images.append(thumbnail_img)
return processed_images, target_aspect_ratio
def normalize_transform(mean, std):
if mean is None and std is None:
transform = None
elif mean is None and std is not None:
mean = [0.] * len(std)
transform = transforms.Normalize(mean=mean, std=std)
elif mean is not None and std is None:
std = [1.] * len(mean)
transform = transforms.Normalize(mean=mean, std=std)
else:
transform = transforms.Normalize(mean=mean, std=std)
return transform
def format_messages(
tokenizer: T,
conversations: List[Dict[str, str]],
system_prompt: str = "",
):
if system_prompt is not None and system_prompt != "":
sys_prompt = {
"role": "system",
"content": system_prompt,
}
conversations = [sys_prompt] + conversations
sft_prompt = tokenizer.apply_chat_template(
conversations,
)
return sft_prompt
def text_encode(tokenizer, text: str, bos: bool = True, eos: bool = False):
"""
Encode text with optional BOS/EOS tokens.
Note: Qwen2VL tokenizer has bos_token_id=None, so we skip BOS for Qwen.
The chat template handles special tokens automatically.
"""
t = tokenizer.encode(text, add_special_tokens=False)
bos_id = tokenizer.bos_token_id
eos_id = tokenizer.eos_token_id
# Only add BOS if tokenizer has one AND bos=True
if bos and bos_id is not None:
t = [bos_id] + t
# Only add EOS if tokenizer has one AND eos=True
if eos and eos_id is not None:
t = t + [eos_id]
return t
def load_pil_images(conversations: List[Dict[str, str]]) -> List[Image.Image]:
pil_images = []
for message in conversations:
pil_image = None
if message["role"].lower() == "user":
if isinstance(message["content"], List):
for d in message["content"]:
if d.get("type", "") == "image":
# Support both "image" (Qwen format) and "data" keys
image_path = d.get("image") or d.get("data", "")
pil_image = load_image(image_path)
elif isinstance(message["content"], Dict):
if message["content"].get("type", "") == "image":
# Support both "image" (Qwen format) and "data" keys
image_path = message["content"].get("image") or message["content"].get("data", "")
pil_image = load_image(image_path)
if pil_image is not None:
pil_images.append(pil_image)
return pil_images
class BaseTransform(ABC):
def set_rng(self, *args, **kwargs):
pass
def __call__(self, *args, **kwargs) -> torch.Tensor:
pass
@property
def default_shape(self):
raise NotImplementedError
class BasicImageTransform(BaseTransform):
def __init__(
self,
mean: Optional[Tuple[float, float, float]] = (0.5, 0.5, 0.5),
std: Optional[Tuple[float, float, float]] = (0.5, 0.5, 0.5),
normalize: bool = True
):
self.mean = mean
self.std = std
transform_pipelines = [
transforms.ToTensor()
]
normalize = normalize_transform(mean, std) if normalize else nn.Identity()
if normalize is not None:
transform_pipelines.append(normalize)
self.transform = transforms.Compose(transform_pipelines)
def __call__(self, x):
x = self.transform(x)
return x
class NoEOSTextStreamer(TextStreamer):
def on_finalized_text(self, text: str, stream_end: bool = False):
eos_text = self.tokenizer.decode([self.tokenizer.eos_token_id], skip_special_tokens=False)
text = text.replace(eos_text, "\n")
print(text, flush=True, end="")
# @title Create datacollator
import torch
import math
from dataclasses import dataclass
from typing import Dict, List, Any, Tuple
from PIL import Image, ImageOps
from torch.nn.utils.rnn import pad_sequence
import io
# Use local functions (Qwen-compatible) instead of DeepSeek's versions
# from deepseek_ocr.modeling_deepseekocr import (
# format_messages,
# text_encode,
# BasicImageTransform,
# dynamic_preprocess,
# )
@dataclass
class DeepQwenDataCollator:
"""
Data collator for DeepQwen model using Qwen2VL tokenizer.
This collator processes images using DeepSeek OCR's dynamic cropping algorithm
while maintaining compatibility with Qwen2VL's tokenization format.
Key token mappings (Qwen2VL):
- image_token: <|image_pad|> (id=151655)
- vision_start: <|vision_start|> (id=151652)
- vision_end: <|vision_end|> (id=151653)
- eos_token: <|im_end|> (id=151645)
- NO bos_token (bos_token_id is None)
Args:
tokenizer: Qwen2VL Tokenizer
model: Model
image_size: Size for image patches (default: 640)
base_size: Size for global view (default: 1024)
crop_mode: Whether to use dynamic cropping for large images
train_on_responses_only: If True, only train on assistant responses (mask user prompts)
"""
tokenizer: T
model: Any
image_size: int = 640
base_size: int = 1024
crop_mode: bool = True
train_on_responses_only: bool = True
def __init__(
self,
tokenizer,
model,
image_size: int = 640,
base_size: int = 1024,
crop_mode: bool = True,
train_on_responses_only: bool = True,
max_length: int = None,
):
self.tokenizer = tokenizer
self.model = model
self.image_size = image_size
self.base_size = base_size
self.crop_mode = crop_mode
self.dtype = model.dtype # Get dtype from model
self.train_on_responses_only = train_on_responses_only
self.max_length = max_length # None means no truncation
# Qwen2VL specific token IDs
# <|image_pad|> = 151655
self.image_token_id = getattr(tokenizer, 'image_token_id', None)
if self.image_token_id is None:
# Fallback: try to get from added_tokens or use default Qwen2VL value
self.image_token_id = 151655 # Qwen2VL's <|image_pad|>
self.image_token = tokenizer.decode([self.image_token_id], skip_special_tokens=False)
# Vision wrapper tokens for Qwen2VL format
self.vision_start_token_id = getattr(tokenizer, 'vision_start_token_id', 151652)
self.vision_end_token_id = getattr(tokenizer, 'vision_end_token_id', 151653)
self.image_transform = BasicImageTransform(
mean=(0.5, 0.5, 0.5),
std=(0.5, 0.5, 0.5),
normalize=True
)
self.patch_size = 16
self.downsample_ratio = 4
# Qwen2VL has NO bos_token (bos_token_id is None)
# The chat template handles conversation formatting
self.bos_id = tokenizer.bos_token_id # Will be None for Qwen2VL
self.eos_id = tokenizer.eos_token_id # 151645 for Qwen2VL
self.pad_token_id = tokenizer.pad_token_id # 151643 for Qwen2VL
def deserialize_image(self, image_data) -> Image.Image:
"""Convert image data (bytes dict, PIL Image, or file path) to PIL Image in RGB mode"""
if isinstance(image_data, Image.Image):
return image_data.convert("RGB")
elif isinstance(image_data, str):
# File path - load lazily
image = load_image(image_data)
if image is None:
raise ValueError(f"Failed to load image from path: {image_data}")
return image.convert("RGB")
elif isinstance(image_data, dict) and 'bytes' in image_data:
image_bytes = image_data['bytes']
image = Image.open(io.BytesIO(image_bytes))
return image.convert("RGB")
else:
raise ValueError(f"Unsupported image format: {type(image_data)}")
def calculate_image_token_count(self, image: Image.Image, crop_ratio: Tuple[int, int]) -> int:
"""Calculate the number of tokens this image will generate"""
num_queries = math.ceil((self.image_size // self.patch_size) / self.downsample_ratio)
num_queries_base = math.ceil((self.base_size // self.patch_size) / self.downsample_ratio)
width_crop_num, height_crop_num = crop_ratio
if self.crop_mode:
img_tokens = num_queries_base * num_queries_base + 1
if width_crop_num > 1 or height_crop_num > 1:
img_tokens += (num_queries * width_crop_num + 1) * (num_queries * height_crop_num)
else:
img_tokens = num_queries * num_queries + 1
return img_tokens
def process_image(self, image: Image.Image) -> Tuple[List, List, List, List, Tuple[int, int]]:
"""
Process a single image based on crop_mode and size thresholds
Returns:
Tuple of (images_list, images_crop_list, images_spatial_crop, tokenized_image, crop_ratio)
"""
images_list = []
images_crop_list = []
images_spatial_crop = []
if self.crop_mode:
# Determine crop ratio based on image size
if image.size[0] <= 640 and image.size[1] <= 640:
crop_ratio = (1, 1)
images_crop_raw = []
else:
images_crop_raw, crop_ratio = dynamic_preprocess(
image, min_num=2, max_num=9,
image_size=self.image_size, use_thumbnail=False
)
# Process global view with padding
global_view = ImageOps.pad(
image, (self.base_size, self.base_size),
color=tuple(int(x * 255) for x in self.image_transform.mean)
)
images_list.append(self.image_transform(global_view).to(self.dtype))
width_crop_num, height_crop_num = crop_ratio
images_spatial_crop.append([width_crop_num, height_crop_num])
# Process local views (crops) if applicable
if width_crop_num > 1 or height_crop_num > 1:
for crop_img in images_crop_raw:
images_crop_list.append(
self.image_transform(crop_img).to(self.dtype)
)
# Calculate image tokens
num_queries = math.ceil((self.image_size // self.patch_size) / self.downsample_ratio)
num_queries_base = math.ceil((self.base_size // self.patch_size) / self.downsample_ratio)
tokenized_image = ([self.image_token_id] * num_queries_base + [self.image_token_id]) * num_queries_base
tokenized_image += [self.image_token_id]
if width_crop_num > 1 or height_crop_num > 1:
tokenized_image += ([self.image_token_id] * (num_queries * width_crop_num) + [self.image_token_id]) * (
num_queries * height_crop_num)
else: # crop_mode = False
crop_ratio = (1, 1)
images_spatial_crop.append([1, 1])
# For smaller base sizes, resize; for larger, pad
if self.base_size <= 640:
resized_image = image.resize((self.base_size, self.base_size), Image.LANCZOS)
images_list.append(self.image_transform(resized_image).to(self.dtype))
else:
global_view = ImageOps.pad(
image, (self.base_size, self.base_size),
color=tuple(int(x * 255) for x in self.image_transform.mean)
)
images_list.append(self.image_transform(global_view).to(self.dtype))
num_queries = math.ceil((self.base_size // self.patch_size) / self.downsample_ratio)
tokenized_image = ([self.image_token_id] * num_queries + [self.image_token_id]) * num_queries
tokenized_image += [self.image_token_id]
return images_list, images_crop_list, images_spatial_crop, tokenized_image, crop_ratio
def process_single_sample(self, messages: List[Dict]) -> Dict[str, Any]:
"""
Process a single conversation into model inputs.
Expected message format (Qwen2.5-VL native style):
[
{
"role": "user",
"content": [
{"type": "image", "image": <PIL.Image or path or bytes>},
{"type": "text", "text": "Describe this image."}
]
},
{
"role": "assistant",
"content": [{"type": "text", "text": "This is a description..."}]
}
]
Also supports string content for backward compatibility.
"""
# --- 1. Setup ---
tokenized_str = []
images_seq_mask = []
images_list, images_crop_list, images_spatial_crop = [], [], []
prompt_token_count = -1 # Index to start training
assistant_started = False
# Qwen2VL has NO bos_token, so we don't add one
for message in messages:
role = message["role"].lower() # Normalize role to lowercase
content = message["content"]
# Check if this is the assistant's turn
if role == "assistant":
if not assistant_started:
# This is the split point. All tokens added *so far*
# are part of the prompt.
prompt_token_count = len(tokenized_str)
assistant_started = True
# Process content based on format
if isinstance(content, list):
# Qwen2.5-VL native format: content is a list of typed items
content_parts = []
for item in content:
item_type = item.get("type", "")
if item_type == "image":
# Get image data from various possible keys
image_data = item.get("image") or item.get("data")
if image_data is not None:
pil_image = self.deserialize_image(image_data)
# Process the image through DeepSeek's encoder
img_list, crop_list, spatial_crop, tok_img, _ = self.process_image(pil_image)
images_list.extend(img_list)
images_crop_list.extend(crop_list)
images_spatial_crop.extend(spatial_crop)
# Add image placeholder tokens
tokenized_str.extend(tok_img)
images_seq_mask.extend([True] * len(tok_img))
elif item_type == "text":
text = item.get("text", "")
# For assistant, append EOS at the end of all text
if role == "assistant" and item == content[-1]:
if self.tokenizer.eos_token:
text = f"{text.strip()}{self.tokenizer.eos_token}"
# Tokenize the text
tokenized_text = text_encode(self.tokenizer, text, bos=False, eos=False)
tokenized_str.extend(tokenized_text)
images_seq_mask.extend([False] * len(tokenized_text))
else:
# Legacy format: content is a string (backward compatibility)
text_content = content
# For assistant, append EOS token
if role == "assistant" and self.tokenizer.eos_token:
text_content = f"{text_content.strip()}{self.tokenizer.eos_token}"
# Tokenize the text
tokenized_text = text_encode(self.tokenizer, text_content, bos=False, eos=False)
tokenized_str.extend(tokenized_text)
images_seq_mask.extend([False] * len(tokenized_text))
# --- 2. Validation and Final Prep ---
# If we never found an assistant message, we're in a weird state
# (e.g., user-only prompt). We mask everything.
if not assistant_started:
print("Warning: No assistant message found in sample. Masking all tokens.")
prompt_token_count = len(tokenized_str)
# # DEBUG: Print after processing
# print(f"[DEBUG] tokenized_str length: {len(tokenized_str)}")
# print(f"[DEBUG] images_seq_mask length: {len(images_seq_mask)}, True count: {sum(images_seq_mask)}")
# print(f"[DEBUG] images_list length: {len(images_list)}")
# print(f"[DEBUG] images_crop_list length: {len(images_crop_list)}")
# print(f"[DEBUG] prompt_token_count: {prompt_token_count}")
# Prepare image tensors
images_ori = torch.stack(images_list, dim=0)
images_spatial_crop_tensor = torch.tensor(images_spatial_crop, dtype=torch.long)
if images_crop_list:
images_crop = torch.stack(images_crop_list, dim=0)
else:
images_crop = torch.zeros((1, 3, self.base_size, self.base_size), dtype=self.dtype)
return {
"input_ids": torch.tensor(tokenized_str, dtype=torch.long),
"images_seq_mask": torch.tensor(images_seq_mask, dtype=torch.bool),
"images_ori": images_ori,
"images_crop": images_crop,
"images_spatial_crop": images_spatial_crop_tensor,
"prompt_token_count": prompt_token_count, # This is now accurate
}
def __call__(self, features: List[Dict[str, Any]]) -> Dict[str, torch.Tensor]:
"""
Collate batch of samples.
Expected feature format:
{
"prompt": str, # The user's question/instruction
"response": str, # The assistant's response
"image": PIL.Image or bytes dict # The image
}
This will be converted to Qwen2.5-VL native conversation format:
[
{
"role": "user",
"content": [
{"type": "image", "image": <PIL.Image>},
{"type": "text", "text": "<prompt>"}
]
},
{
"role": "assistant",
"content": [{"type": "text", "text": "<response>"}]
}
]
"""
batch_data = []
# Process each sample
for feature in features:
try:
# Get image from either 'image' or 'image_path' key (lazy loading support)
image_data = feature.get('image') or feature.get('image_path')
if image_data is None:
raise ValueError("Sample missing both 'image' and 'image_path' keys")
# Use Qwen2.5-VL native message format
# content is a list of typed items: {"type": "image", ...} or {"type": "text", ...}
messages = [
{
"role": "user",
"content": [
{"type": "image", "image": image_data},
{"type": "text", "text": feature['prompt']}
]
},
{
"role": "assistant",
"content": [
{"type": "text", "text": feature["response"]}
]
}
]
processed = self.process_single_sample(messages)
batch_data.append(processed)
except Exception as e:
print(f"Error processing sample: {e}")
continue
if not batch_data:
raise ValueError("No valid samples in batch")
# Extract lists
input_ids_list = [item['input_ids'] for item in batch_data]
images_seq_mask_list = [item['images_seq_mask'] for item in batch_data]
prompt_token_counts = [item['prompt_token_count'] for item in batch_data]
# Pad sequences using Qwen2VL's pad_token_id (151643 = <|endoftext|>)
input_ids = pad_sequence(input_ids_list, batch_first=True, padding_value=self.pad_token_id)
images_seq_mask = pad_sequence(images_seq_mask_list, batch_first=True, padding_value=False)
# Truncate to max_length if specified (prevents OOM on long sequences)
if self.max_length is not None and input_ids.shape[1] > self.max_length:
input_ids = input_ids[:, :self.max_length]
images_seq_mask = images_seq_mask[:, :self.max_length]
# Adjust prompt_token_counts if they exceed max_length
prompt_token_counts = [min(p, self.max_length) for p in prompt_token_counts]
# Create labels
labels = input_ids.clone()
# Mask padding tokens
labels[labels == self.pad_token_id] = -100
# Mask image tokens (model shouldn't predict these)
labels[images_seq_mask] = -100
# Mask user prompt tokens when train_on_responses_only=True (only train on assistant responses)
if self.train_on_responses_only:
for idx, prompt_count in enumerate(prompt_token_counts):
if prompt_count > 0:
labels[idx, :prompt_count] = -100
# Create attention mask
attention_mask = (input_ids != self.pad_token_id).long()
images_batch = []
for item in batch_data:
images_batch.append((item['images_crop'], item['images_ori']))
images_spatial_crop = torch.cat([item['images_spatial_crop'] for item in batch_data], dim=0)
return {
"input_ids": input_ids,
"attention_mask": attention_mask,
"labels": labels,
"images": images_batch,
"images_seq_mask": images_seq_mask,
"images_spatial_crop": images_spatial_crop,
}
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