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import os
os.system('cd fairseq;'
'pip install ./; cd ..')
os.system('ls -l')
import torch
import numpy as np
from fairseq import utils, tasks
from fairseq import checkpoint_utils
from utils.eval_utils import eval_step
from tasks.mm_tasks.caption import CaptionTask
from models.ofa import OFAModel
from PIL import Image
from torchvision import transforms
import gradio as gr
# Register caption task
tasks.register_task('caption', CaptionTask)
# turn on cuda if GPU is available
use_cuda = torch.cuda.is_available()
# use fp16 only when GPU is available
use_fp16 = False
os.system('wget https://ofa-silicon.oss-us-west-1.aliyuncs.com/checkpoints/caption_large_best_clean.pt; '
'mkdir -p checkpoints; mv caption_large_best_clean.pt checkpoints/caption.pt')
# Load pretrained ckpt & config
overrides = {"bpe_dir": "utils/BPE", "eval_cider": False, "beam": 5,
"max_len_b": 16, "no_repeat_ngram_size": 3, "seed": 7}
models, cfg, task = checkpoint_utils.load_model_ensemble_and_task(
utils.split_paths('checkpoints/caption.pt'),
arg_overrides=overrides
)
# Move models to GPU
for model in models:
model.eval()
if use_fp16:
model.half()
if use_cuda and not cfg.distributed_training.pipeline_model_parallel:
model.cuda()
model.prepare_for_inference_(cfg)
# Initialize generator
generator = task.build_generator(models, cfg.generation)
mean = [0.5, 0.5, 0.5]
std = [0.5, 0.5, 0.5]
patch_resize_transform = transforms.Compose([
lambda image: image.convert("RGB"),
transforms.Resize((cfg.task.patch_image_size, cfg.task.patch_image_size), interpolation=Image.BICUBIC),
transforms.ToTensor(),
transforms.Normalize(mean=mean, std=std),
])
# Text preprocess
bos_item = torch.LongTensor([task.src_dict.bos()])
eos_item = torch.LongTensor([task.src_dict.eos()])
pad_idx = task.src_dict.pad()
def encode_text(text, length=None, append_bos=False, append_eos=False):
s = task.tgt_dict.encode_line(
line=task.bpe.encode(text),
add_if_not_exist=False,
append_eos=False
).long()
if length is not None:
s = s[:length]
if append_bos:
s = torch.cat([bos_item, s])
if append_eos:
s = torch.cat([s, eos_item])
return s
# Construct input for caption task
def construct_sample(image: Image):
patch_image = patch_resize_transform(image).unsqueeze(0)
patch_mask = torch.tensor([True])
src_text = encode_text(" what does the image describe?", append_bos=True, append_eos=True).unsqueeze(0)
src_length = torch.LongTensor([s.ne(pad_idx).long().sum() for s in src_text])
sample = {
"id": np.array(['42']),
"net_input": {
"src_tokens": src_text,
"src_lengths": src_length,
"patch_images": patch_image,
"patch_masks": patch_mask
}
}
return sample
# Function to turn FP32 to FP16
def apply_half(t):
if t.dtype is torch.float32:
return t.to(dtype=torch.half)
return t
# Function for image captioning
def image_caption(Image):
sample = construct_sample(Image)
sample = utils.move_to_cuda(sample) if use_cuda else sample
sample = utils.apply_to_sample(apply_half, sample) if use_fp16 else sample
with torch.no_grad():
result, scores = eval_step(task, generator, models, sample)
return result[0]['caption']
title = "OFA-Image_Caption"
description = "Gradio Demo for OFA-Image_Caption. Upload your own image or click any one of the examples, and click " \
"\"Submit\" and then wait for the generated caption. "
article = "<p style='text-align: center'><a href='https://github.com/OFA-Sys/OFA' target='_blank'>OFA Github " \
"Repo</a></p> "
examples = [['beatles.jpeg'], ['aurora.jpeg'], ['good_luck.png'], ['pokemons.jpg'], ['donuts.jpg']]
io = gr.Interface(fn=image_caption, inputs=gr.inputs.Image(type='pil'), outputs=gr.outputs.Textbox(label="Caption"),
title=title, description=description, article=article, examples=examples,
allow_flagging=False, allow_screenshot=False)
io.launch()
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