labelgenius 0.1.5

Flexible GPT + CLIP classification toolkit for multimodal labeling

LabelGenius

A lightweight research toolkit for multimodal classification using GPT (text/image/both) and CLIP (zero-shot or fine-tuned). Built for quick, reproducible experiments and paper appendices.

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Quick Links

• Try the Colab Demo — Run the full tutorial in your browser
• Case Studies — Complete replication scripts in the Case_analysis/ folder
• GitHub Repository

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What Can You Do?

LabelGenius helps you:

• Label with GPT — Classify text, images, or multimodal data using zero-shot or few-shot prompting
• Classify with CLIP — Run zero-shot classification or fine-tune a lightweight model
• Evaluate results — Get accuracy, F1 scores, and confusion matrices automatically
• Estimate costs — Calculate API expenses before running large-scale experiments

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Installation

From PyPI (recommended):

pip install labelgenius

Pinned version:

pip install labelgenius==0.1.5

From source:

git clone https://github.com/mediaccs/LabelGenius
cd labelgenius
pip install -e .

Requirements: Python 3.9+, dependencies auto-installed from pyproject.toml. To manually install dependencies, see pyproject.toml for the full list. For GPT features, get an API key from OpenAI.

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Core Functions

GPT Classification

Function	Purpose
classification_GPT	Text classification (zero-shot or few-shot)
generate_GPT_finetune_jsonl	Prepare training data for fine-tuning
finetune_GPT	Fine-tune a GPT model

CLIP Classification (if data cannot be shared with business)

Function	Purpose
classification_CLIP_0_shot	Zero-shot classification with CLIP
classification_CLIP_finetuned	Use a fine-tuned CLIP model
finetune_CLIP	Fine-tune CLIP on your dataset

Utilities

Function	Purpose
auto_verification	Calculate classification metrics
price_estimation	Estimate OpenAI API costs

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Quick Start

Import the Library

from labelgenius import (
    classification_GPT,
    classification_CLIP_0_shot,
    finetune_CLIP,
    classification_CLIP_finetuned,
    auto_verification,
    price_estimation,
)

Prepare Your Data

• Text only: CSV/Excel/JSON with your text columns
• Images only: Directory of images (with optional ID mapping table)
• Multimodal: Table with image_id column + images at image_dir/<image_id>.jpg

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Using GPT Models

LabelGenius supports both GPT-4.1 and GPT-5 with different control mechanisms:

GPT-4.1 (Temperature-Based)

Control randomness with temperature (0 = deterministic, 2 = creative):

df = classification_GPT(
    text_path="data/headlines.xlsx",
    category=["sports", "politics", "tech"],
    prompt="Classify this headline into one category.",
    column_4_labeling=["headline"],
    model="gpt-4.1",
    temperature=0.7,
    mode="text",
    output_column_name="predicted_category"
)

GPT-5 (Reasoning and Non-Reasoning)

GPT-5 supports both reasoning and non-reasoning modes controlled by reasoning_effort:

df = classification_GPT(
    text_path="data/headlines.xlsx",
    category=["sports", "politics", "tech"],
    prompt="Classify this headline into one category.",
    column_4_labeling=["headline"],
    model="gpt-5",
    reasoning_effort="medium",  # minimal | low | medium | high
    mode="text",
    output_column_name="predicted_category"
)

Reasoning Modes:

• "minimal" — Non-reasoning mode (fast, standard responses)
• "low" / "medium" / "high" — Reasoning modes (increasing reasoning depth)

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Function Reference

classification_GPT

Classify text, images, or multimodal data using GPT models.

Parameters:

• text_path — Path to your data file (CSV/Excel/JSON)
• category — List of possible category labels
• prompt — Instruction prompt for classification
• column_4_labeling — Column(s) to use as input
• model — Model name (e.g., "gpt-4.1", "gpt-5")
• temperature — Randomness control for GPT-4.1 (0-2)
• reasoning_effort — Reasoning depth for GPT-5 ("minimal", "low", "medium", "high")
• mode — Input type: "text", "image", or "both"
• output_column_name — Name for prediction column
• num_themes — Number of themes for multi-label tasks (default: 1)
• num_votes — Number of runs for majority voting (default: 1)

Example (Single-Label Text):

df = classification_GPT(
    text_path="data/articles.csv",
    category=["positive", "negative", "neutral"],
    prompt="Classify the sentiment of this article.",
    column_4_labeling=["title", "content"],
    model="gpt-4.1",
    temperature=0.5,
    mode="text",
    output_column_name="sentiment"
)

Example (Multi-Label with Majority Voting):

prompt = """Label these 5 topics with 0 or 1. Return up to two 1s.
Answer format: [0,0,0,0,0]"""

df = classification_GPT(
    text_path="data/posts.xlsx",
    category=["0", "1"],
    prompt=prompt,
    column_4_labeling=["post_text"],
    model="gpt-5",
    reasoning_effort="low",
    mode="text",
    output_column_name="topic_labels",
    num_themes=5,
    num_votes=3  # Run 3 times and use majority vote
)

Note: You can control the number of labels by adjusting the prompt. For example:

• "Return exactly one 1" — Single label
• "Return up to two 1s" — Up to 2 labels
• "Return up to three 1s" — Up to 3 labels
• "Return any number of 1s" — Unrestricted multi-label

Example (Multimodal):

df = classification_GPT(
    text_path="data/products.csv",
    category=["electronics", "clothing", "food"],
    prompt="Classify this product based on text and image.",
    column_4_labeling=["product_name", "description"],
    model="gpt-4.1",
    temperature=0.3,
    mode="both",  # Uses both text and images
    image_dir="data/product_images",
    output_column_name="category"
)

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generate_GPT_finetune_jsonl

Prepare training data in JSONL format for GPT fine-tuning.

Parameters:

• df — DataFrame containing your training data
• output_path — Where to save the JSONL file
• system_prompt — Instruction prompt for the model
• input_col — Column(s) to use as input
• label_col — Column(s) containing true labels

Example:

generate_GPT_finetune_jsonl(
    df=training_data,
    output_path="finetune_data.jsonl",
    system_prompt="Classify the sentiment of this review.",
    input_col=["review_text"],
    label_col=["sentiment"]
)

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finetune_GPT

Launch a GPT fine-tuning job using OpenAI's API.

Parameters:

• training_file_path — Path to your JSONL training file
• model — Base model to fine-tune (must be a snapshot model, i.e., model name ending with a specific date, e.g., "gpt-4o-mini-2024-07-18")
• hyperparameters — Dict with batch_size, learning_rate_multiplier, etc.

Returns: Fine-tuned model identifier

Example:

model_id = finetune_GPT(
    training_file_path="finetune_data.jsonl",
    model="gpt-4o-mini-2024-07-18",
    hyperparameters={
        "batch_size": 8,
        "learning_rate_multiplier": 0.01,
        "n_epochs": 3
    }
)
print(f"Fine-tuned model: {model_id}")

Note: GPT-5 fine-tuning availability varies. Use GPT-4 snapshots if needed.

Using the fine-tuned model:

After fine-tuning completes, you'll receive a model ID via email or in the Python output. Use this ID with classification_GPT by replacing the model parameter:

# Use your fine-tuned model for classification
df = classification_GPT(
    text_path="data/test.csv",
    category=["positive", "negative", "neutral"],
    prompt="Classify the sentiment of this review.",
    column_4_labeling=["review_text"],
    model="ft:gpt-4o-mini-2024-07-18:your-org:model-name:abc123",  # Your fine-tuned model ID
    temperature=0.5,
    mode="text",
    output_column_name="sentiment"
)

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classification_CLIP_0_shot

Perform zero-shot classification using CLIP without training.

Parameters:

• text_path — Path to your data file
• img_dir — Directory containing images (optional)
• mode — Input type: "text", "image", or "both"
• prompt — List of category names/descriptions for zero-shot
• text_column — Column(s) to use for text input
• predict_column — Name for prediction column

Example (Text Only):

df = classification_CLIP_0_shot(
    text_path="data/articles.csv",
    mode="text",
    prompt=["sports news", "political news", "technology news"],
    text_column=["headline", "summary"],
    predict_column="clip_category"
)

Example (Image Only):

df = classification_CLIP_0_shot(
    text_path="data/image_ids.csv",
    img_dir="data/images",
    mode="image",
    prompt=["a photo of a cat", "a photo of a dog", "a photo of a bird"],
    predict_column="animal_type"
)

Example (Multimodal):

df = classification_CLIP_0_shot(
    text_path="data/posts.csv",
    img_dir="data/post_images",
    mode="both",
    prompt=["advertisement", "personal photo", "news image"],
    text_column=["caption"],
    predict_column="image_category"
)

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finetune_CLIP

Fine-tune CLIP on your labeled dataset with a small classification head.

Parameters:

• mode — Input type: "text", "image", or "both"
• text_path — Path to training data
• text_column — Column(s) for text input (if using text)
• img_dir — Image directory (if using images)
• true_label — Column containing true labels
• model_name — Filename to save the trained model
• num_epochs — Number of training epochs
• batch_size — Training batch size
• learning_rate — Learning rate for optimizer

Returns: Best validation accuracy achieved

Example:

best_acc = finetune_CLIP(
    mode="both",
    text_path="data/train.csv",
    text_column=["headline", "description"],
    img_dir="data/train_images",
    true_label="category_id",
    model_name="my_clip_model.pth",
    num_epochs=10,
    batch_size=16,
    learning_rate=1e-5
)
print(f"Best validation accuracy: {best_acc:.2%}")

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classification_CLIP_finetuned

Use your fine-tuned CLIP model to classify new data.

Parameters:

• mode — Input type: "text", "image", or "both"
• text_path — Path to test data
• img_dir — Image directory (if using images)
• model_name — Path to your trained model file
• text_column — Column(s) for text input
• predict_column — Name for prediction column
• num_classes — Number of categories in your task

Example:

df = classification_CLIP_finetuned(
    mode="both",
    text_path="data/test.csv",
    img_dir="data/test_images",
    model_name="my_clip_model.pth",
    text_column=["headline", "description"],
    predict_column="predicted_category",
    num_classes=24
)

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auto_verification

Calculate classification metrics including accuracy, F1 scores, and confusion matrix.

Parameters:

• df — DataFrame with predictions and true labels
• predicted_cols — List of prediction column names
• true_cols — List of true label column names
• category — List of possible categories

Example:

auto_verification(
    df=results,
    predicted_cols=["gpt_pred", "clip_pred"],
    true_cols=["true_label", "true_label"],
    category=["0", "1"]
)

Output: Prints accuracy, F1 scores, and displays confusion matrix visualization.

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price_estimation

Estimate the cost of OpenAI API calls.

Parameters:

• response — OpenAI API response object
• num_rows — Number of data rows processed
• input_cost_per_million — Input token cost (in USD per 1M tokens)
• output_cost_per_million — Output token cost (in USD per 1M tokens)
• num_votes — Number of API calls per row (for majority voting)

Returns: Estimated total cost in USD

Example:

cost = price_estimation(
    response=api_response,
    num_rows=1000,
    input_cost_per_million=5.0,
    output_cost_per_million=15.0,
    num_votes=3
)
print(f"Estimated total cost: ${cost:.2f}")

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Important Notes

Demo Scale:
The Colab demo uses ~20 samples per task for speed. Expect high variance in small-sample results.

Training Data Requirements:
Fine-tuning typically requires hundreds of examples per class. Small datasets (~20 examples) may lead to overfitting or majority-class predictions.

Image Requirements:
For multimodal classification, ensure your image_id column matches filenames in image_dir.

Model Availability:
GPT-5 fine-tuning may not be available for all accounts. Use GPT-4 snapshots as alternatives.

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Contributing

We welcome contributions! Feel free to open an issue for bugs or feature requests, or submit a pull request to improve the codebase and documentation.

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License

LabelGenius is released under the MIT License.