Image-Text-to-Text
Transformers
Safetensors
panorama_chat
feature-extraction
panoptic-grounded-captioning
grounded-captioning
segmentation
multimodal
conversational
custom_code
PANORAMA-2B / predict_panocaps.py
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#!/usr/bin/env python3
"""PANORAMA — panoptic captioning + segmentation on your own images.
The model writes a caption in which every object and background region is named inside
<p>...</p> and immediately followed by a [SEG] token; each [SEG] returns a binary mask.
python predict_panocaps.py --model . --image photo.jpg --out ./out
"""
import argparse
import json
import os
import re
import numpy as np
import torch
from PIL import Image
from transformers import AutoModel, AutoProcessor, AutoTokenizer
# The EXACT prompt this model is evaluated with. Do not paraphrase it: near-paraphrases
# ("describe the image in detail", ...) were trained toward a SPARSER output style, so
# rewording quietly thins the coverage.
PANOCAPS_PROMPT = ('Write a caption covering all objects and background regions in the image, '
'inserting the matching segmentation mask after each phrase.')
PHRASE_RE = re.compile(r'<p>(.*?)</p>', re.S)
def load(model_path):
model = AutoModel.from_pretrained(
model_path,
dtype=torch.bfloat16, # REQUIRED: the model is trained and evaluated in bf16
low_cpu_mem_usage=True,
trust_remote_code=True, # the architecture ships with the weights
).eval().cuda()
tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True)
processor = AutoProcessor.from_pretrained(model_path, trust_remote_code=True)
return model, tokenizer, processor
@torch.no_grad()
def predict(model, tokenizer, processor, image):
out = model.predict_forward(
image=image,
text='<image>\n' + PANOCAPS_PROMPT,
tokenizer=tokenizer,
processor=processor,
)
caption = out['prediction'].replace('<|im_end|>', '').strip()
# Prefer the per-INSTANCE masks: one phrase can name several things ("three dogs"), and the
# model selects a set per phrase. prediction_masks gives one union mask per [SEG] instead.
inst = out.get('prediction_instance_masks')
counts = out.get('prediction_phrase_seg_counts')
src = inst if (inst is not None and counts is not None) else out.get('prediction_masks')
masks = (np.stack([np.asarray(m) for m in src])[:, 0] if src is not None and len(src)
else np.zeros((0, image.size[1], image.size[0]), dtype=bool))
return caption, masks, counts
def main():
ap = argparse.ArgumentParser()
ap.add_argument('--model', required=True, help='path to (or HF id of) the model')
ap.add_argument('--image', required=True, help='an image file, or a directory of images')
ap.add_argument('--out', default='./out')
a = ap.parse_args()
imgs = ([os.path.join(a.image, f) for f in sorted(os.listdir(a.image))
if f.lower().endswith(('.jpg', '.jpeg', '.png', '.webp', '.bmp'))]
if os.path.isdir(a.image) else [a.image])
assert imgs, (f'no images found directly in {a.image} '
f'(jpg/jpeg/png/webp/bmp; not recursive — subfolders are ignored)')
# outputs are keyed by STEM, so cat.jpg and cat.png would both write cat.json/cat_masks.npz and
# the second would clobber the first. Fail loudly instead of silently losing a result.
seen = {}
for p in imgs:
seen.setdefault(os.path.splitext(os.path.basename(p))[0], []).append(os.path.basename(p))
clash = {k: v for k, v in seen.items() if len(v) > 1}
assert not clash, (f'filename clash — these share a stem and would overwrite each other: {clash}. '
f'Rename so each image has a unique name (without extension).')
os.makedirs(a.out, exist_ok=True)
model, tokenizer, processor = load(a.model)
print(f'loaded. {len(imgs)} image(s)\n')
for p in imgs:
image = Image.open(p).convert('RGB')
caption, masks, counts = predict(model, tokenizer, processor, image)
stem = os.path.splitext(os.path.basename(p))[0]
np.savez_compressed(os.path.join(a.out, f'{stem}_masks.npz'), masks=masks)
json.dump({'image': p, 'caption': caption,
'phrases': PHRASE_RE.findall(caption),
'n_masks': int(len(masks)),
'masks_per_phrase': counts},
open(os.path.join(a.out, f'{stem}.json'), 'w'), indent=2)
print(f'--- {os.path.basename(p)}')
print(f' {caption}')
print(f' {len(masks)} mask(s) -> {stem}_masks.npz (bool, N x H x W, image resolution)\n')
if __name__ == '__main__':
main()