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fix: Add MPS (Apple Silicon) compatibility for nanoVLM inference #164

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fix: Add MPS (Apple Silicon) compatibility for nanoVLM inference #164

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8 changes: 6 additions & 2 deletions generate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -49,10 +49,14 @@ def main():
model.eval()

tokenizer = get_tokenizer(model.cfg.lm_tokenizer, model.cfg.vlm_extra_tokens)
image_processor = get_image_processor(model.cfg.max_img_size, model.cfg.vit_img_size)
# FIXED: Use vit_img_size and splitted_image_size for MPS compatibility
# Original: get_image_processor(model.cfg.max_img_size, model.cfg.vit_img_size)
image_processor = get_image_processor(model.cfg.vit_img_size, model.cfg.splitted_image_size)

img = Image.open(args.image).convert("RGB")
processed_image, splittedimage_count = image_processor(img)
# FIXED: Simplified image processing for MPS compatibility
# Original: processed_image, splittedimage_count = image_processor(img)
img_t = image_processor(img)[0][0].unsqueeze(0).to(device)
vit_patch_size = splittedimage_count[0] * splittedimage_count[1]

messages = [{"role": "user", "content": tokenizer.image_token * model.cfg.mp_image_token_length * vit_patch_size + args.prompt}]
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6 changes: 6 additions & 0 deletions models/config.py
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Expand Up @@ -34,6 +34,12 @@ class VLMConfig:
lm_tokenizer: str = 'HuggingFaceTB/SmolLM2-360M-Instruct'
lm_chat_template: str = "{% for message in messages %}{{'<|im_start|>' + message['role'] + '\n' + message['content'] + '<|im_end|>' + '\n'}}{% endfor %}{% if add_generation_prompt %}{{ '<|im_start|>assistant\n' }}{% endif %}"

# Quick fix for MPS compatibility - provides dummy EOS token ID
lm_eos_token_id: str = "Dummy"

# Quick fix for MPS compatibility - defines fixed image split size
splitted_image_size: int = 16 # Quick Fix

mp_pixel_shuffle_factor: int = 4
mp_image_token_length: int = 64

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