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import os
import json
from torch.utils.data import Dataset
from torchvision.datasets.utils import download_url
from PIL import Image
from data.utils import pre_caption
class flickr30k_train(Dataset):
def __init__(self, transform, image_root, ann_root, max_words=30, prompt=''):
'''
image_root (string): Root directory of images (e.g. flickr30k/)
ann_root (string): directory to store the annotation file
'''
url = 'https://storage.googleapis.com/sfr-vision-language-research/datasets/flickr30k_train.json'
filename = 'flickr30k_train.json'
download_url(url,ann_root)
self.annotation = json.load(open(os.path.join(ann_root,filename),'r'))
self.transform = transform
self.image_root = image_root
self.max_words = max_words
self.prompt = prompt
self.img_ids = {}
n = 0
for ann in self.annotation:
img_id = ann['image_id']
if img_id not in self.img_ids.keys():
self.img_ids[img_id] = n
n += 1
def __len__(self):
return len(self.annotation)
def __getitem__(self, index):
ann = self.annotation[index]
image_path = os.path.join(self.image_root,ann['image'])
image = Image.open(image_path).convert('RGB')
image = self.transform(image)
caption = self.prompt+pre_caption(ann['caption'], self.max_words)
return image, caption, self.img_ids[ann['image_id']]
class flickr30k_retrieval_eval(Dataset):
def __init__(self, transform, image_root, ann_root, split, max_words=30):
'''
image_root (string): Root directory of images (e.g. flickr30k/)
ann_root (string): directory to store the annotation file
split (string): val or test
'''
urls = {'val':'https://storage.googleapis.com/sfr-vision-language-research/datasets/flickr30k_val.json',
'test':'https://storage.googleapis.com/sfr-vision-language-research/datasets/flickr30k_test.json'}
filenames = {'val':'flickr30k_val.json','test':'flickr30k_test.json'}
download_url(urls[split],ann_root)
self.annotation = json.load(open(os.path.join(ann_root,filenames[split]),'r'))
self.transform = transform
self.image_root = image_root
self.text = []
self.image = []
self.txt2img = {}
self.img2txt = {}
txt_id = 0
for img_id, ann in enumerate(self.annotation):
self.image.append(ann['image'])
self.img2txt[img_id] = []
for i, caption in enumerate(ann['caption']):
self.text.append(pre_caption(caption,max_words))
self.img2txt[img_id].append(txt_id)
self.txt2img[txt_id] = img_id
txt_id += 1
def __len__(self):
return len(self.annotation)
def __getitem__(self, index):
image_path = os.path.join(self.image_root, self.annotation[index]['image'])
image = Image.open(image_path).convert('RGB')
image = self.transform(image)
return image, index |