在 GPT-4o 上进行视觉微调以实现视觉问答

from IPython.display import display

# display a random training example
print('QUESTION:', ds_train.iloc[198]['question'])
display(ds_train.iloc[198]['image'])
print('ANSWER:', ds_train.iloc[198]['answer'])

from tqdm import tqdm

# constructing the training set
json_data = []

for idx, example in tqdm(ds_train.iterrows()):
    system_message = {
        "role": "system",
        "content": [{"type": "text", "text": SYSTEM_PROMPT}]
    }
    
    user_message = {
        "role": "user",
        "content": [
            {"type": "text", "text": f"Question [{idx}]: {example['question']}"},
            {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{encode_image(example['image'], quality=50)}"}}
        ]
    }
    
    assistant_message = {
        "role": "assistant",
        "content": [{"type": "text", "text": example["answer"]}]
    }

    all_messages = [system_message] + FEW_SHOT_EXAMPLES + [user_message, assistant_message]
    
    json_data.append({"messages": all_messages})

# constructing the validation set
json_data = []

for idx, example in tqdm(ds_val.iterrows()):
    system_message = {
        "role": "system",
        "content": [{"type": "text", "text": SYSTEM_PROMPT}]
    }
    
    user_message = {
        "role": "user",
        "content": [
            {"type": "text", "text": f"Question [{idx}]: {example['question']}"},
            {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{encode_image(example['image'], quality=50)}"}}
        ]
    }

    assistant_message = {
        "role": "assistant",
        "content": [{"type": "text", "text": example["answer"]}]
    }

    all_messages = [system_message] + FEW_SHOT_EXAMPLES + [user_message, assistant_message]
    
    json_data.append({"messages": all_messages})

# save the JSON data to a file
with open("ocr-vqa-validation.jsonl", "w") as f:
    for message in json_data:
        json.dump(message, f)
        f.write("\n")

# constructing the test set
json_data = []

for idx, example in tqdm(ds_test.iterrows()):
    system_message = {
        "role": "system",
        "content": [{"type": "text", "text": SYSTEM_PROMPT}]
    }
    
    user_message = {
        "role": "user",
        "content": [
            {"type": "text", "text": f"Question [{idx}]: {example['question']}"},
            {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{encode_image(example['image'], quality=50)}"}}
        ]
    }

    all_messages = [system_message] + FEW_SHOT_EXAMPLES + [user_message]
    
    json_data.append({"messages": all_messages})

# save the JSON data to a file
with open("ocr-vqa-test.jsonl", "w") as f:
    for message in json_data:
        json.dump(message, f)
        f.write("\n")

# create fine tuning job
file_train = train_file.id
file_val = val_file.id

client.fine_tuning.jobs.create(
  training_file=file_train,
  # note: validation file is optional
  validation_file=file_val,
  model="gpt-4o-2024-08-06"
)

from concurrent.futures import ThreadPoolExecutor, as_completed
import re

# load the test data from JSONL file
test_data = []
with open("ocr-vqa-test.jsonl", "r") as f:
    for line in f:
        test_data.append(json.loads(line))

def process_example(example, model):
    response = client.chat.completions.create(
        model=model,
        messages=example["messages"],
        store=True,
        metadata={'dataset': 'ocr-vqa-test'}
    )
    predicted_answer = response.choices[0].message.content.strip()
    
    # regex to get the question ID
    match = re.search(r'\[(\d+)\]', example["messages"][-1]["content"][0]["text"])
    if match:
        example_id = int(match.group(1))
    else:
        example_id = -1
    
    actual_answer = ds_test.iloc[example_id]['answer']

    return {
        "example_id": example_id,
        "predicted_answer": predicted_answer,
        "actual_answer": actual_answer
    }

# run the prompts through the finetuned model and store the results
model = "ft:gpt-4o-2024-08-06:openai::AOY1M8VG"
results = []
with ThreadPoolExecutor() as executor:
    futures = {executor.submit(process_example, example, model): example for example in test_data}
    for future in tqdm(as_completed(futures), total=len(futures)):
        results.append(future.result())

# save the results to a file
with open("ocr-vqa-ft-results.jsonl", "w") as f:
    for result in results:
        json.dump(result, f)
        f.write("\n")

# run the prompts through the non-fine-tuned model and store the results
model = "gpt-4o"
results = []
with ThreadPoolExecutor() as executor:
    futures = {executor.submit(process_example, example, model): example for example in test_data}
    for future in tqdm(as_completed(futures), total=len(futures)):
        results.append(future.result())

# save the results to a file
with open("ocr-vqa-4o-results.jsonl", "w") as f:
    for result in results:
        json.dump(result, f)
        f.write("\n")

from pydantic import BaseModel, Field

# define output schema
class Result(BaseModel):
    example_id: int = Field(description="The unique ID of the question")
    rating: str = Field(description="The assigned similarity rating. One of [Very Similar | Mostly Similar | Somewhat Similar | Incorrect]")
    type: str = Field(description="The type of question. Open if the question is binary yes/no, otherwise Closed. One of [Open | Closed]")

EVAL_PROMPT = """
Evaluate the closeness between the predicted answer and the ground truth for each provided result.
Rank the predicted answer based on the following criteria:

1. **Very Similar**: The predicted answer exactly matches the ground truth and there is no important information omitted, although there may be some minor ommissions or discrepancies in punctuation.
2. **Mostly Similar**: The predicted answer closely aligns with the ground truth, perhaps with some missing words or phrases.
3. **Somewhat Similar**: Although the predicted answer has noticeable differences to the ground truth, the core content is accurate and semantically similar, perhaps with some missing information.
4. **Incorrect**: The predicted answer is completely incorrect, irrelevant, or contains critical errors or omissions from the ground truth.

Ensure to consider both open-ended and yes/no questions.

# Steps
1. **Analyze the Answers**: Read the predicted answer, and ground truth carefully.
2. **Evaluate Similarity**:
    - Check if the predicted answer contains the same core information and correctness as the ground truth.
    - Determine if there are any important omissions or errors.
3. **Assign a Rating**: Based on your evaluation, assign the appropriate rating: Very Similar, Mostly Similar, Somewhat Similar, or Incorrect.

# Output Format
```json
[
    {
        "example_id": [example_id],
        "rating": "[Very Similar | Mostly Similar | Somewhat Similar | Incorrect]",
        "type": "[Open | Closed]
    }
]
```

# Examples

**Input:**
```json
{"example_id": 6, "predicted_answer": "A Wrinkle in Time", "actual_answer": "A Wrinkle in Time (Time Quintet)"}
```
**Reasoning:**
The predicted answer "A Wrinkle in Time" is a very close match to the ground truth "A Wrinkle in Time (Time Quintet)" with a missing tagline or subtitle.
**Output:**
```json
{ "example_id": 6, "rating": "Mostly Similar", "type": "Open" }
```

**Input:**
```json
{"example_id": 437, "predicted_answer": "Cookshack, Inc.", "actual_answer": "Cookshack"}
```
**Reasoning:**
The predicted answer "Cookshack, Inc." is exactly the same as the ground truth "Cookshack", with only a difference in punctuation.
**Output:**
```json
{ "example_id": 437, "rating": "Very Similar", "type": "Open" }
```

**Input:**
```json
{"example_id": 482, "predicted_answer": "Christian Books & Bibles", "actual_answer": "Religion & Spirituality"}
```
**Reasoning:**
The predicted answer "Christian Books & Bibles" is semantically similar to the ground truth "Religion & Spirituality", however there is a key difference in the predicted answer.
**Output:**
```json
{ "example_id": 482, "rating": "Somewhat Similar", "type": "Open" }
```

**Input:**
```json
{ "example_id": 417, "predicted_answer": "yes", "actual_answer": "no" }
```
**Reasoning:**
The predicted answer "yes" is completely incorrect compared to the actual answer "no."
**Output:**
```json
{ "example_id": 417, "rating": "Incorrect", "type": "Closed" }
```
"""

def process_result(result):
    messages = [
        {
            "role": "system",
            "content": EVAL_PROMPT
        },
        {
            "role": "user",
            "content": str(result)
        }
    ]

    response = client.beta.chat.completions.parse(
        model='gpt-4o',
        messages=messages,
        temperature=0,
        response_format=Result
    )

    return json.loads(response.choices[0].message.content)

# fine-tuned model results with scores
results = []
with open("ocr-vqa-ft-results.jsonl", "r") as f:
    for line in f:
        results.append(json.loads(line))

results_w_scores = []
with ThreadPoolExecutor() as executor:
    futures = {executor.submit(process_result, result): result for result in results}
    for future in tqdm(as_completed(futures), total=len(futures)):
        results_w_scores.append(future.result())

# Save the results to a file
with open("ocr-vqa-ft-similarity.jsonl", "w") as f:
    for score in results_w_scores:
        json.dump(score, f)
        f.write("\n")

# non-fine-tuned model results with scores
results = []
with open("ocr-vqa-4o-results.jsonl", "r") as f:
    for line in f:
        results.append(json.loads(line))

results_w_scores_4o = []
with ThreadPoolExecutor() as executor:
    futures = {executor.submit(process_result, result): result for result in results}
    for future in tqdm(as_completed(futures), total=len(futures)):
        results_w_scores_4o.append(future.result())

# Save the results to a file
with open("ocr-vqa-4o-similarity.jsonl", "w") as f:
    for score in results_w_scores_4o:
        json.dump(score, f)
        f.write("\n")

# read in results
results_ft = []
with open("ocr-vqa-ft-results.jsonl", "r") as f:
    for line in f:
        results_ft.append(json.loads(line))

results_4o = []
with open("ocr-vqa-4o-results.jsonl", "r") as f:
    for line in f:
        results_4o.append(json.loads(line))

# filter results for yes/no questions
results_ft_closed = [result for result in results_ft if result['actual_answer'] in ['Yes', 'No']]
results_4o_closed = [result for result in results_4o if result['actual_answer'] in ['Yes', 'No']]

# check for correct predictions
correct_ft_closed = [result for result in results_ft_closed if result['predicted_answer'] == result['actual_answer']]
correct_4o_closed = [
    result for result in results_4o_closed 
    if result['predicted_answer'].lower() == result['actual_answer'].lower() 
    or result['actual_answer'].lower() in result['predicted_answer'].lower()
]
print(f"Fine-tuned model accuracy: {round(100*len(correct_ft_closed) / len(results_ft_closed), 2)}%")
print(f"Non-fine-tuned model accuracy: {round(100*len(correct_4o_closed) / len(results_4o_closed), 2)}%")

# filter results for open-ended questions
results_ft_open = [result for result in results_ft if result['actual_answer'] not in ['Yes', 'No']]
results_4o_open = [result for result in results_4o if result['actual_answer'] not in ['Yes', 'No']]

# check for correct predictions
correct_ft_open = [result for result in results_ft_open if result['predicted_answer'] == result['actual_answer']]
correct_4o_open = [
    result for result in results_4o_open 
    if result['predicted_answer'].lower() == result['actual_answer'].lower() 
    or result['actual_answer'].lower() in result['predicted_answer'].lower()
]
print(f"Fine-tuned model accuracy: {round(100*len(correct_ft_open) / len(results_ft_open), 2)}%")
print(f"Non-fine-tuned model accuracy: {round(100*len(correct_4o_open) / len(results_4o_open), 2)}%")

import matplotlib.pyplot as plt

# seperate by question type
def get_question_type(question):
    if question in ["What is the title of this book?"]:
        return "Title"
    elif question in ["What is the genre of this book?", "What type of book is this?"]:
        return "Genre"
    elif question in ["Who wrote this book?", "Who is the author of this book?"]:
        return "Author"
    else:
        return "Other"

# get index numbers for each question type
question_type_indexes = {
    "Title": [],
    "Genre": [],
    "Author": [],
    "Other": []
}

for idx, row in ds_test.iterrows():
    question_type = get_question_type(row['question'])
    question_type_indexes[question_type].append(idx)

# plot accuracy by question type]
accuracy_by_type_ft = {}
accuracy_by_type_4o = {}

for question_type, indexes in question_type_indexes.items():
    correct_predictions_ft = [
        result for result in results_ft if result['example_id'] in indexes and (
            result['predicted_answer'].lower() == result['actual_answer'].lower() or
            result['actual_answer'].lower() in result['predicted_answer'].lower()
        )
    ]
    correct_predictions_4o = [
        result for result in results_4o if result['example_id'] in indexes and (
            result['predicted_answer'].lower() == result['actual_answer'].lower() or
            result['actual_answer'].lower() in result['predicted_answer'].lower()
        )
    ]
    accuracy_ft = len(correct_predictions_ft) / len(indexes) if indexes else 0
    accuracy_4o = len(correct_predictions_4o) / len(indexes) if indexes else 0
    accuracy_by_type_ft[question_type] = accuracy_ft * 100 
    accuracy_by_type_4o[question_type] = accuracy_4o * 100

# prepare data for plotting
question_types = list(accuracy_by_type_ft.keys())
accuracies_ft = list(accuracy_by_type_ft.values())
accuracies_4o = list(accuracy_by_type_4o.values())

# plot grouped bar chart
bar_width = 0.35
index = range(len(question_types))

plt.figure(figsize=(10, 6))
bar1 = plt.bar(index, accuracies_ft, bar_width, label='Fine-tuned GPT-4o', color='skyblue')
bar2 = plt.bar([i + bar_width for i in index], accuracies_4o, bar_width, label='Non-fine-tuned GPT-4o', color='lightcoral')

plt.xlabel('Question Type')
plt.ylabel('Accuracy (%)')
plt.title('Accuracy by Question Type')
plt.ylim(0, 100)
plt.xticks([i + bar_width / 2 for i in index], question_types, rotation=45)
plt.legend()

plt.show()

from collections import Counter

# extract ratings
ratings_ft = [result['rating'] for result in results_w_scores if result['type'] == 'Open']
ratings_4o = [result['rating'] for result in results_w_scores_4o if result['type'] == 'Open']

# count occurrences of each rating
rating_counts_ft = Counter(ratings_ft)
rating_counts_4o = Counter(ratings_4o)

# define the order of ratings
rating_order = ["Very Similar", "Mostly Similar", "Somewhat Similar", "Incorrect"]

# create bar chart
bar_width = 0.35
index = range(len(rating_order))

fig, ax = plt.subplots()
bar1 = ax.bar(index, [rating_counts_ft.get(rating, 0) for rating in rating_order], bar_width, label='FT GPT-4o')
bar2 = ax.bar([i + bar_width for i in index], [rating_counts_4o.get(rating, 0) for rating in rating_order], bar_width, label='GPT-4o')

ax.set_xlabel('Ratings')
ax.set_ylabel('Count')
ax.set_title('Ratings Distribution')
ax.set_xticks([i + bar_width / 2 for i in index])
ax.set_xticklabels(rating_order)
ax.legend()

plt.show()