class VQADataset(torch.utils.data.Dataset):
"""VQA (v2) dataset."""
def __init__(self, questions, annotations, tokenizer, image_preprocess, frcnn, frcnn_cfg):
self.questions = questions
self.annotations = annotations
self.tokenizer = tokenizer
self.image_preprocess = image_preprocess
self.frcnn = frcnn
self.frcnn_cfg = frcnn_cfg
def __len__(self):
return len(self.annotations)
def __getitem__(self, idx):
# answer
annotation = self.annotations[idx]
# question
questions = self.questions[idx]
image_path = id_to_filename[annotation["image_id"]]
image_path = image_path.replace("./multimodal_data/vqa2/val2014/.", "", 1)
text = questions['question']
inputs = self.tokenizer(
text,
padding="max_length",
max_length=25,
truncation=True,
return_token_type_ids=True,
return_attention_mask=True,
add_special_tokens=True,
return_tensors="pt")
images, sizes, scales_yx = self.image_preprocess(image_path)
output_dict = self.frcnn(
images,
sizes,
scales_yx=scales_yx,
padding="max_detections",
max_detections=self.frcnn_cfg.max_detections,
return_tensors="pt")
# Very important that the boxes are normalized
feature = output_dict.get("roi_features")
normalized_boxes = output_dict.get("normalized_boxes")
inputs.update(
{
"visual_embeds": feature,
"visual_attention_mask": torch.ones(feature.shape[:-1], dtype=torch.float),
# "visual_token_type_ids": torch.ones(feature.shape[:-1], dtype=torch.long),
"output_attentions": False
}
)
# remove batch dimension
for k, v in inputs.items():
if isinstance(v, torch.Tensor):
inputs[k] = v.squeeze()
# add labels
labels = annotation['labels']
# print("label candidate:", labels)
scores = annotation["scores"]
targets = torch.zeros(len(config.id2label), dtype=torch.float)
for label, score in zip(labels, scores):
# print(f"Setting target at index {label} to {score}")
targets[label] = score
inputs["labels"] = targets
inputs["text"] = text
print(text)
return inputs
from visualbert.processing_image import Preprocess
from visualbert.visualizing_image import SingleImageViz
from visualbert.modeling_frcnn import GeneralizedRCNN
from visualbert.utils import Config
frcnn_cfg = Config.from_pretrained("unc-nlp/frcnn-vg-finetuned")
frcnn = GeneralizedRCNN.from_pretrained("unc-nlp/frcnn-vg-finetuned", config=frcnn_cfg)
image_preprocess = Preprocess(frcnn_cfg)
from transformers import VisualBertForQuestionAnswering, AutoTokenizer, BertTokenizerFast
tokenizer = AutoTokenizer.from_pretrained("bert-base-uncased")
model = VisualBertForQuestionAnswering.from_pretrained("uclanlp/visualbert-vqa",
num_labels=len(config.id2label),
id2label=config.id2label,
label2id=config.label2id,
output_hidden_states=True)
model.to(device)
model.eval()
dataset = VQADataset(questions=questions[:100],
annotations=annotations[:100],
tokenizer=tokenizer,
image_preprocess=image_preprocess,
frcnn=frcnn,
frcnn_cfg=frcnn_cfg)
test_dataloader = DataLoader(dataset, batch_size=1, shuffle=False)
correct = 0.0
total = 0
for batch in tqdm(test_dataloader):
batch = {k: v.to(device) for k, v in batch.items()}
outputs = model(**batch)
logits = outputs.logits # [batch_size, 3129]
_, pre = torch.max(logits, 1)
_, target = torch.max(batch["labels"], 1)
print("prediction:", pre)
print("target:", target)
print("Predicted answer:", model.config.id2label[pre.item()])
print("Target answer:", model.config.id2label[target.item()])
correct += (pre == target).sum()
total = total + 1
print(total)
final_acc = correct / float(len(test_dataloader.dataset))
print('Accuracy of test: %f %%' % (100 * float(final_acc)))
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