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219 lines
8.0 KiB
Python
219 lines
8.0 KiB
Python
"""Embedding service using BGE-M3 model."""
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import time
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import numpy as np
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from typing import List, Dict, Optional
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from FlagEmbedding import BGEM3FlagModel
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from logger import VectorSearchLogger, log_execution_time
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import logging
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class EmbeddingService:
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"""Service for generating embeddings using BGE-M3 model."""
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def __init__(self, model_name: str = "BAAI/bge-m3", use_fp16: bool = True,
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max_seq_length: int = 512, logger: Optional[VectorSearchLogger] = None):
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"""
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Initialize the embedding service with BGE-M3 model.
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Args:
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model_name: Name of the BGE-M3 model
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use_fp16: Whether to use FP16 for inference
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max_seq_length: Maximum sequence length
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logger: Logger instance for educational output
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"""
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self.model_name = model_name
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self.use_fp16 = use_fp16
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self.max_seq_length = max_seq_length
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self.logger = logger
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self.std_logger = logging.getLogger("vector_search")
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# Initialize the model
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self._initialize_model()
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def _initialize_model(self):
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"""Initialize the BGE-M3 model."""
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start_time = time.time()
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if self.logger:
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self.logger.logger.info(f"🚀 Initializing BGE-M3 model: {self.model_name}")
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self.logger.logger.debug(f" - Using FP16: {self.use_fp16}")
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self.logger.logger.debug(f" - Max sequence length: {self.max_seq_length}")
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try:
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self.model = BGEM3FlagModel(
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self.model_name,
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use_fp16=self.use_fp16
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)
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# Get embedding dimension by encoding a test sentence
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test_embedding = self.model.encode(["test"])
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if isinstance(test_embedding, dict):
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self.embedding_dim = test_embedding['dense_vecs'].shape[1]
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else:
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self.embedding_dim = test_embedding.shape[1]
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load_time = time.time() - start_time
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if self.logger:
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self.logger.logger.info(f"✅ Model loaded successfully in {load_time:.2f} seconds")
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self.logger.logger.debug(f" - Embedding dimension: {self.embedding_dim}")
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self.logger.logger.debug(f" - Model supports: dense, sparse, and multi-vector retrieval")
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except Exception as e:
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if self.logger:
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self.logger.logger.error(f"Failed to load model: {e}")
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raise
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@log_execution_time()
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def encode_text(self, text: str, return_sparse: bool = False,
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return_colbert: bool = False) -> Dict[str, np.ndarray]:
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"""
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Encode a single text into embeddings.
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Args:
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text: Input text to encode
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return_sparse: Whether to return sparse embeddings
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return_colbert: Whether to return ColBERT embeddings
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Returns:
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Dictionary containing different types of embeddings
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"""
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start_time = time.time()
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if self.logger:
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self.logger.logger.debug(f"📝 Encoding text (length: {len(text)} chars)")
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self.logger.logger.debug(f" Text preview: {text[:100]}..." if len(text) > 100 else f" Text: {text}")
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# Encode the text
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embeddings = self.model.encode(
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[text],
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return_dense=True,
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return_sparse=return_sparse,
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return_colbert_vecs=return_colbert
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)
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# Extract dense embeddings
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dense_vec = embeddings['dense_vecs'][0]
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result = {
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'dense': dense_vec,
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'dimension': len(dense_vec)
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}
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# Add sparse embeddings if requested
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if return_sparse and 'lexical_weights' in embeddings:
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result['sparse'] = embeddings['lexical_weights'][0]
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if self.logger:
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num_tokens = len(result['sparse'])
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self.logger.logger.debug(f" Sparse embedding: {num_tokens} non-zero tokens")
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# Add ColBERT embeddings if requested
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if return_colbert and 'colbert_vecs' in embeddings:
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result['colbert'] = embeddings['colbert_vecs'][0]
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if self.logger:
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colbert_shape = result['colbert'].shape
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self.logger.logger.debug(f" ColBERT embedding shape: {colbert_shape}")
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encoding_time = time.time() - start_time
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if self.logger:
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self.logger.logger.debug(f"✅ Encoding completed in {encoding_time:.4f} seconds")
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self.logger.log_embedding_vector(dense_vec, sample_size=10)
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return result
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@log_execution_time()
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def encode_batch(self, texts: List[str], return_sparse: bool = False,
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return_colbert: bool = False) -> Dict[str, np.ndarray]:
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"""
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Encode multiple texts into embeddings.
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Args:
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texts: List of input texts to encode
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return_sparse: Whether to return sparse embeddings
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return_colbert: Whether to return ColBERT embeddings
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Returns:
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Dictionary containing different types of embeddings for all texts
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"""
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start_time = time.time()
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if self.logger:
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self.logger.logger.info(f"📚 Batch encoding {len(texts)} texts")
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total_chars = sum(len(t) for t in texts)
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self.logger.logger.debug(f" Total characters: {total_chars}")
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avg_len = total_chars / len(texts) if texts else 0.0
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self.logger.logger.debug(f" Average text length: {avg_len:.1f} chars")
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# Encode all texts
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embeddings = self.model.encode(
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texts,
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return_dense=True,
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return_sparse=return_sparse,
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return_colbert_vecs=return_colbert
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)
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result = {
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'dense': embeddings['dense_vecs'],
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'dimension': embeddings['dense_vecs'].shape[1],
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'num_texts': len(texts)
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}
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# Add sparse embeddings if requested
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if return_sparse and 'lexical_weights' in embeddings:
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result['sparse'] = embeddings['lexical_weights']
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# Add ColBERT embeddings if requested
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if return_colbert and 'colbert_vecs' in embeddings:
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result['colbert'] = embeddings['colbert_vecs']
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encoding_time = time.time() - start_time
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if self.logger:
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self.logger.logger.info(f"✅ Batch encoding completed in {encoding_time:.4f} seconds")
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avg_time = encoding_time / len(texts) if texts else 0.0
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self.logger.logger.debug(f" Average time per text: {avg_time:.4f} seconds")
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return result
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def get_embedding_dimension(self) -> int:
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"""Get the dimension of the embeddings."""
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return self.embedding_dim
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def compute_similarity(self, vec1: np.ndarray, vec2: np.ndarray,
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metric: str = "cosine") -> float:
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"""
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Compute similarity between two vectors.
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Args:
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vec1: First vector
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vec2: Second vector
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metric: Similarity metric ('cosine', 'euclidean', 'dot')
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Returns:
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Similarity score
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"""
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if metric == "cosine":
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# Cosine similarity
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dot_product = np.dot(vec1, vec2)
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norm1 = np.linalg.norm(vec1)
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norm2 = np.linalg.norm(vec2)
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similarity = dot_product / (norm1 * norm2)
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elif metric == "euclidean":
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# Euclidean distance (negative for similarity)
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similarity = -np.linalg.norm(vec1 - vec2)
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elif metric == "dot":
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# Dot product
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similarity = np.dot(vec1, vec2)
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else:
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raise ValueError(f"Unknown metric: {metric}")
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if self.logger:
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self.logger.logger.debug(f" Similarity ({metric}): {similarity:.6f}")
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return float(similarity)
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