---
license: apache-2.0
inference: true
widget:
 - text: "<s>[INST] <<SYS>>\nGiven an image description, generate one or two multiple-choice questions that verifies if the image description is correct.\nClassify each concept into a type (object, human, animal, food, activity, attribute, counting, color, material, spatial, location, shape, other), and then generate a question for each type.\n\n<</SYS>>\n\nDescription: a blue rabbit and a red plane [/INST] Entities:"
pipeline_tag: text-generation
tags:
- text-generation-inference
- llama2
- text-to-image
datasets:
- TIFA
language:
- en
---
This is the text parsing and question generation model for the ICCV 2023 paper [TIFA: Accurate and Interpretable Text-to-Image Faithfulness Evaluation with Question Answering](https://arxiv.org/abs/2303.11897)

We introduce TIFA (Text-to-Image Faithfulness evaluation with question Answering), an automatic evaluation metric that measures the faithfulness of a generated image to its text input via visual question answering (VQA). Specifically, given a text input, we automatically generate several question-answer pairs using a language model. We calculate image faithfulness by checking whether existing VQA models can answer these questions using the generated image. 

Specifically, this fine-tuned LLaMA 2 model is the substitute for the GPT-3 model in the paper. It can parse an arbitrary prompt into visual entities, attributes, relations, etc. and generate question-answer tuples for each of them. See examples below.


# QuickStart

All codes are from <https://github.com/Yushi-Hu/tifa>. Clone this repo to easily use this model together with other modules (e.g. VQA) provided in TIFA.

Please follow the prompt format, which will give the best performance.


```python
import torch
import transformers

# prepare the LLaMA 2 model
model_name = "/gscratch/tial/yushihu/tifa-all/llama2/results/llama2/final_question_generation_checkpoint"
pipeline = transformers.pipeline(
    "text-generation",
    model=model_name,
    torch_dtype=torch.float16,
    device_map="auto",
)


# formating prompt following LLaMA 2 style
def create_qg_prompt(caption):
    INTRO_BLURB = "Given an image description, generate one or two multiple-choice questions that verifies if the image description is correct.\nClassify each concept into a type (object, human, animal, food, activity, attribute, counting, color, material, spatial, location, shape, other), and then generate a question for each type.\n"
    formated_prompt = f"<s>[INST] <<SYS>>\n{INTRO_BLURB}\n<</SYS>>\n\n"
    formated_prompt += f"Description: {caption} [/INST] Entities:"
    return formated_prompt


test_caption = "a blue rabbit and a red plane"

# create prompt
prompt = create_qg_prompt(text_caption)

# text completion
sequences = pipeline(
        prompt, do_sample=False, num_beams=5, num_return_sequences=1, max_length=512)
output = sequences[0]['generated_text'][len(prompt):]
output = output.split('\n\n')[0]

# output
print(output)

#### Expected output ###
#  rabbit, plane
# Activites:
# Colors: blue, red
# Counting:
# Other attributes:
# About rabbit (animal):
# Q: is this a rabbit?
# Choices: yes, no
# A: yes
# About rabbit (animal):
# Q: what animal is in the picture?
# Choices: rabbit, dog, cat, fish
# A: rabbit
# About plane (object):
# Q: is this a plane?
# Choices: yes, no
# A: yes
# About plane (object):
# Q: what type of vehicle is this?
# Choices: plane, car, motorcycle, bus
# A: plane
# About blue (color):
# Q: is the rabbit blue?
# Choices: yes, no
# A: yes
# About blue (color):
# Q: what color is the rabbit?
# Choices: blue, red, yellow, green
# A: blue
# About red (color):
# Q: is the plane red?
# Choices: yes, no
# A: yes
# About red (color):
# Q: what color is the plane?
# Choices: red, blue, yellow, green
# A: red
```

# Use this LM under tifascore package

tifascore provides extra functions to parse this output etc. First install tifascore according to <https://github.com/Yushi-Hu/tifa>. Then the usage is below

```python
from tifascore import get_llama2_pipeline, get_llama2_question_and_answers

pipeline = get_llama2_pipeline("tifa-benchmark/llama2_tifa_question_generation")

print(get_llama2_question_and_answers(pipeline, "a blue rabbit and a red plane"))

#### Expected output ###
# [{'caption': 'a blue rabbit and a red plane', 'element': 'rabbit', 'question': 'what animal is in the picture?', 'choices': ['rabbit', 'dog', 'cat', 'fish'], 'answer': 'rabbit', 'element_type': 'animal/human'}, {'caption': 'a blue rabbit and a red plane', 'element': 'plane', 'question': 'is this a plane?', 'choices': ['yes', 'no'], 'answer': 'yes', 'element_type': 'object'}, {'caption': 'a blue rabbit and a red plane', 'element': 'plane', 'question': 'what type of vehicle is this?', 'choices': ['plane', 'car', 'motorcycle', 'bus'], 'answer': 'plane', 'element_type': 'object'}, {'caption': 'a blue rabbit and a red plane', 'element': 'blue', 'question': 'is the rabbit blue?', 'choices': ['yes', 'no'], 'answer': 'yes', 'element_type': 'color'}, {'caption': 'a blue rabbit and a red plane', 'element': 'blue', 'question': 'what color is the rabbit?', 'choices': ['blue', 'red', 'yellow', 'green'], 'answer': 'blue', 'element_type': 'color'}, {'caption': 'a blue rabbit and a red plane', 'element': 'red', 'question': 'is the plane red?', 'choices': ['yes', 'no'], 'answer': 'yes', 'element_type': 'color'}, {'caption': 'a blue rabbit and a red plane', 'element': 'red', 'question': 'what color is the plane?', 'choices': ['red', 'blue', 'yellow', 'green'], 'answer': 'red', 'element_type': 'color'}]
```

## Bibtex
```
@article{hu2023tifa,
  title={Tifa: Accurate and interpretable text-to-image faithfulness evaluation with question answering},
  author={Hu, Yushi and Liu, Benlin and Kasai, Jungo and Wang, Yizhong and Ostendorf, Mari and Krishna, Ranjay and Smith, Noah A},
  journal={arXiv preprint arXiv:2303.11897},
  year={2023}
}
```