app.py

import gradio as gr
from datasets import load_dataset
import numpy as np
from model2vec import StaticModel
from reach import Reach
from difflib import ndiff

def deduplicate(embedding_matrix: np.ndarray, threshold: float, batch_size: int = 1024, progress=gr.Progress(track_tqdm=True)) -> tuple[np.ndarray, dict[int, int]]:
    """
    Deduplicate embeddings and return the deduplicated indices and a mapping of removed indices to their corresponding original indices.
    """
    reach = Reach(vectors=embedding_matrix, items=[str(i) for i in range(len(embedding_matrix))])

    # Use a set for deduplicated indices and keep track of duplicates
    deduplicated_indices = set(range(len(embedding_matrix)))  # Start with all indices as deduplicated
    duplicate_to_original_mapping = {}

    results = reach.nearest_neighbor_threshold(
        embedding_matrix, 
        threshold=threshold, 
        batch_size=batch_size, 
        show_progressbar=True
    )

    # Process duplicates
    for i, similar_items in enumerate(progress.tqdm(results, desc="Processing duplicates")):
        if i not in deduplicated_indices:
            continue  # Skip already marked duplicates

        # Similar items are returned as (index, score), we are only interested in the index
        similar_indices = [int(item[0]) for item in similar_items if int(item[0]) != i]

        # Mark similar documents as duplicates and map them to the original
        for sim_idx in similar_indices:
            if sim_idx in deduplicated_indices:
                deduplicated_indices.remove(sim_idx)
                duplicate_to_original_mapping[sim_idx] = i  # Map duplicate to original

    return np.array(list(deduplicated_indices)), duplicate_to_original_mapping

def deduplicate_across_datasets(embedding_matrix_1: np.ndarray, embedding_matrix_2: np.ndarray, threshold: float, batch_size: int = 1024, progress=gr.Progress(track_tqdm=True)) -> tuple[list[int], dict[int, int]]:
    """
    Deduplicate embeddings across two datasets and return the indices of duplicates between them.
    """
    reach = Reach(vectors=embedding_matrix_1, items=[str(i) for i in range(len(embedding_matrix_1))])

    # Keep track of duplicates in the second dataset
    duplicate_indices_in_test = []
    duplicate_to_original_mapping = {}

    # Find nearest neighbors from the test set in the train set
    results = reach.nearest_neighbor_threshold(
        embedding_matrix_2, 
        threshold=threshold, 
        batch_size=batch_size, 
        show_progressbar=True
    )

    # Process duplicates
    for i, similar_items in enumerate(progress.tqdm(results, desc="Processing duplicates across datasets")):
        # Similar items are returned as (index, score), we are only interested in the index
        similar_indices = [int(item[0]) for item in similar_items if item[1] >= threshold]  # Keep those above the threshold

        # If we find a similar item in the train set, mark it as a duplicate
        if similar_indices:
            duplicate_indices_in_test.append(i)
            duplicate_to_original_mapping[i] = similar_indices[0]  # Map duplicate in test to original in train

    return duplicate_indices_in_test, duplicate_to_original_mapping

def display_word_differences(x: str, y: str) -> str:
    diff = ndiff(x.split(), y.split())
    return " ".join([word for word in diff if word.startswith(('+', '-'))])

def perform_deduplication(
    deduplication_type,
    dataset1_name,
    dataset1_split,
    dataset1_text_column,
    dataset2_name,
    dataset2_split,
    dataset2_text_column,
    threshold,
    progress=gr.Progress(track_tqdm=True)
):
    # Convert threshold to float
    threshold = float(threshold)
    
    if deduplication_type == "Single dataset":
        # Load the dataset
        ds = load_dataset(dataset1_name, split=dataset1_split)
        
        # Extract texts
        texts = [example[dataset1_text_column] for example in ds]
        
        # Compute embeddings
        model = StaticModel.from_pretrained("minishlab/M2V_base_output")
        embedding_matrix = model.encode(texts, show_progressbar=True)
        
        # Deduplicate
        deduplicated_indices, duplicate_to_original_mapping = deduplicate(embedding_matrix, threshold, progress=progress)
        
        # Prepare the results
        num_duplicates = len(duplicate_to_original_mapping)
        num_total = len(texts)
        num_deduplicated = len(deduplicated_indices)
        
        result_text = f"**Total documents:** {num_total}\n"
        result_text += f"**Number of duplicates found:** {num_duplicates}\n"
        result_text += f"**Number of unique documents after deduplication:** {num_deduplicated}\n\n"
        
        # Show deduplicated examples
        result_text += "**Examples of duplicates found:**\n\n"
        num_examples = min(5, num_duplicates)
        examples_shown = 0
        for duplicate_idx, original_idx in list(duplicate_to_original_mapping.items())[:num_examples]:
            original_text = texts[original_idx]
            duplicate_text = texts[duplicate_idx]
            differences = display_word_differences(original_text, duplicate_text)
            result_text += f"**Original text:**\n{original_text}\n\n"
            result_text += f"**Duplicate text:**\n{duplicate_text}\n\n"
            result_text += f"**Differences:**\n{differences}\n"
            result_text += "-" * 50 + "\n\n"
            examples_shown += 1
        
        return result_text
        
    elif deduplication_type == "Cross-dataset":
        # Load datasets
        ds1 = load_dataset(dataset1_name, split=dataset1_split)
        ds2 = load_dataset(dataset2_name, split=dataset2_split)
        
        # Extract texts
        texts1 = [example[dataset1_text_column] for example in ds1]
        texts2 = [example[dataset2_text_column] for example in ds2]
        
        # Compute embeddings
        model = StaticModel.from_pretrained("minishlab/M2V_base_output")
        embedding_matrix1 = model.encode(texts1, show_progressbar=True)
        embedding_matrix2 = model.encode(texts2, show_progressbar=True)
        
        # Deduplicate across datasets
        duplicate_indices_in_ds2, duplicate_to_original_mapping = deduplicate_across_datasets(embedding_matrix1, embedding_matrix2, threshold, progress=progress)
        
        num_duplicates = len(duplicate_indices_in_ds2)
        num_total_ds2 = len(texts2)
        num_unique_ds2 = num_total_ds2 - num_duplicates
        
        result_text = f"**Total documents in {dataset2_name}/{dataset2_split}:** {num_total_ds2}\n"
        result_text += f"**Number of duplicates found in {dataset2_name}/{dataset2_split}:** {num_duplicates}\n"
        result_text += f"**Number of unique documents in {dataset2_name}/{dataset2_split} after deduplication:** {num_unique_ds2}\n\n"
        
        # Show deduplicated examples
        result_text += "**Examples of duplicates found in Dataset 2:**\n\n"
        num_examples = min(5, num_duplicates)
        examples_shown = 0
        for duplicate_idx in duplicate_indices_in_ds2[:num_examples]:
            original_idx = duplicate_to_original_mapping[duplicate_idx]
            original_text = texts1[original_idx]
            duplicate_text = texts2[duplicate_idx]
            differences = display_word_differences(original_text, duplicate_text)
            result_text += f"**Original text (Dataset 1):**\n{original_text}\n\n"
            result_text += f"**Duplicate text (Dataset 2):**\n{duplicate_text}\n\n"
            result_text += f"**Differences:**\n{differences}\n"
            result_text += "-" * 50 + "\n\n"
            examples_shown += 1
        
        return result_text

with gr.Blocks() as demo:
    gr.Markdown("# Semantic Deduplication")
    
    deduplication_type = gr.Radio(choices=["Single dataset", "Cross-dataset"], label="Deduplication Type", value="Single dataset")
    
    with gr.Tab("Dataset 1"):
        with gr.Row():
            dataset1_name = gr.Textbox(value="ag_news", label="Dataset Name")
            dataset1_split = gr.Textbox(value="train", label="Split")
            dataset1_text_column = gr.Textbox(value="text", label="Text Column Name")
    
    dataset2_tab = gr.Tab("Dataset 2", visible=False)
    with dataset2_tab:
        with gr.Row():
            dataset2_name = gr.Textbox(value="ag_news", label="Dataset Name")
            dataset2_split = gr.Textbox(value="test", label="Split")
            dataset2_text_column = gr.Textbox(value="text", label="Text Column Name")
    
    threshold = gr.Slider(minimum=0.0, maximum=1.0, value=0.8, label="Similarity Threshold")
    
    compute_button = gr.Button("Compute")
    
    output = gr.Markdown()
    
    # Function to update the visibility of dataset2_tab
    def update_visibility(deduplication_type):
        if deduplication_type == "Cross-dataset":
            return {dataset2_tab: gr.update(visible=True)}
        else:
            return {dataset2_tab: gr.update(visible=False)}
    
    deduplication_type.change(update_visibility, inputs=deduplication_type, outputs=[dataset2_tab])
    
    compute_button.click(
        fn=perform_deduplication,
        inputs=[
            deduplication_type, 
            dataset1_name, 
            dataset1_split, 
            dataset1_text_column,
            dataset2_name, 
            dataset2_split, 
            dataset2_text_column,
            threshold
        ],
        outputs=output
    )
    
demo.launch()