Similar Sentence Detection Using Sentence Embeddings

NLP/Sentence_Similarity.py

@@ -0,0 +1,96 @@
+import os
+import numpy as np
+from sentence_transformers import SentenceTransformer, util
+
+MODEL_NAME = 'all-MiniLM-L6-v2'
+MODEL_FOLDER = 'model'
+
+def load_file(file_path):
+    with open(file_path, 'r', encoding='utf-8') as file:
+        return [line.strip() for line in file if line.strip()]
+
+def load_or_download_model():
+    model_path = os.path.join(MODEL_FOLDER, MODEL_NAME)
+    if os.path.exists(model_path):
+        print(f"Loading model from {model_path}")
+        return SentenceTransformer(model_path)
+    else:
+        print(f"Downloading model {MODEL_NAME}")
+        model = SentenceTransformer(MODEL_NAME)
+        os.makedirs(MODEL_FOLDER, exist_ok=True)
+        model.save(model_path)
+        print(f"Model saved to {model_path}")
+        return model
+
+def cosine_similarity(query_embedding, sentence_embeddings):
+    return util.pytorch_cos_sim(query_embedding, sentence_embeddings)[0]
+
+def euclidean_distance(query_embedding, sentence_embeddings):
+    return -np.linalg.norm(query_embedding - sentence_embeddings, axis=1)
+
+def manhattan_distance(query_embedding, sentence_embeddings):
+    return -np.sum(np.abs(query_embedding - sentence_embeddings), axis=1)
+
+def dot_product(query_embedding, sentence_embeddings):
+    return np.dot(sentence_embeddings, query_embedding.T).flatten()
+
+similarity_functions = {
+    '1': ('Cosine Similarity', cosine_similarity),
+    '2': ('Euclidean Distance', euclidean_distance),
+    '3': ('Manhattan Distance', manhattan_distance),
+    '4': ('Dot Product', dot_product)
+}
+
+def find_similar_sentences(query, file_path, similarity_func, top_n=5):
+    model = load_or_download_model()
+    sentences = load_file(file_path)
+    sentence_embeddings = model.encode(sentences)
+    query_embedding = model.encode([query])
+
+    similarity_scores = similarity_func(query_embedding, sentence_embeddings)
+    top_results = sorted(zip(sentences, similarity_scores), key=lambda x: x[1], reverse=True)[:top_n]
+
+    return top_results
+
+def validate_file_path(file_path):
+    if not file_path.endswith('.txt'):
+        file_path += '.txt'
+    if not os.path.exists(file_path):
+        raise FileNotFoundError(f"The file '{file_path}' does not exist.")
+    return file_path
+
+def main():
+    print("Welcome to the Enhanced Sentence Similarity Search Tool!")
+
+    query = input("Enter your query: ")
+
+    while True:
+        file_path = input("Enter the path to your text file without extension: ")
+        try:
+            file_path = validate_file_path(file_path)
+            break
+        except FileNotFoundError as e:
+            print(f"Error: {str(e)} Please try again.")
+
+    print("\nChoose a similarity measurement method:")
+    for key, (name, _) in similarity_functions.items():
+        print(f"{key}. {name}")
+
+    while True:
+        choice = input("Enter the number of your choice: ")
+        if choice in similarity_functions:
+            similarity_name, similarity_func = similarity_functions[choice]
+            break
+        print("Invalid choice. Please try again.")
+
+    try:
+        results = find_similar_sentences(query, file_path, similarity_func)
+        print(f"\nTop 5 similar sentences for query: '{query}' using {similarity_name}\n")
+        for sentence, score in results:
+            print(f"Similarity Score: {score:.4f}")
+            print(f"Sentence: {sentence}\n")
+    except Exception as e:
+        print(f"An error occurred: {str(e)}")
+
+if __name__ == "__main__":
+    main()

NLP/dummysentence.py

@@ -0,0 +1,66 @@
+import os
+from sentence_transformers import SentenceTransformer, util
+
+MODEL_NAME = 'all-MiniLM-L6-v2'
+MODEL_FOLDER = 'model'
+
+def load_file(file_path):
+    with open(file_path, 'r', encoding='utf-8') as file:
+        return [line.strip() for line in file if line.strip()]
+
+def load_or_download_model():
+    model_path = os.path.join(MODEL_FOLDER, MODEL_NAME)
+    if os.path.exists(model_path):
+        print(f"Loading model from {model_path}")
+        return SentenceTransformer(model_path)
+    else:
+        print(f"Downloading model {MODEL_NAME}")
+        model = SentenceTransformer(MODEL_NAME)
+        os.makedirs(MODEL_FOLDER, exist_ok=True)
+        model.save(model_path)
+        print(f"Model saved to {model_path}")
+        return model
+
+def find_similar_sentences(query, file_path, top_n=5):
+    # Load the pre-trained model
+    model = load_or_download_model()
+
+    # Load and encode the sentences from the file
+    sentences = load_file(file_path)
+    sentence_embeddings = model.encode(sentences)
+
+    # Encode the query
+    query_embedding = model.encode([query])
+
+    # Calculate cosine similarities
+    cosine_scores = util.pytorch_cos_sim(query_embedding, sentence_embeddings)[0]
+
+    # Get top N results
+    top_results = sorted(zip(sentences, cosine_scores), key=lambda x: x[1], reverse=True)[:top_n]
+
+    return top_results
+
+def main():
+    print("Welcome to the Sentence Similarity Search Tool!")
+
+    # Get user input for query
+    query = input("Enter your query: ")
+
+    # Get user input for file path
+    file_name = input("Enter the name of your text file (without .txt extension): ")
+    file_path = f"{file_name}.txt"
+
+    try:
+        results = find_similar_sentences(query, file_path)
+
+        print(f"\nTop 5 similar sentences for query: '{query}'\n")
+        for sentence, score in results:
+            print(f"Similarity: {score:.4f}")
+            print(f"Sentence: {sentence}\n")
+    except FileNotFoundError:
+        print(f"Error: The file '{file_path}' was not found. Please check the file name and try again.")
+    except Exception as e:
+        print(f"An error occurred: {str(e)}")
+
+if __name__ == "__main__":
+    main()