feat: enhance diarization with optional output of speaker embeddings

- Updated DiarizationPipeline to include a return_embeddings parameter for optional speaker embeddings.
- Modified assign_word_speakers to accept and process speaker embeddings.
- Updated CLI to support --speaker_embeddings flag for JSON output.
- Ensured backward compatibility for existing functionality.

whisperx/__main__.py

@@ -44,6 +44,7 @@ def cli():
     parser.add_argument("--min_speakers", default=None, type=int, help="Minimum number of speakers to in audio file")
     parser.add_argument("--max_speakers", default=None, type=int, help="Maximum number of speakers to in audio file")
     parser.add_argument("--diarize_model", default="pyannote/speaker-diarization-3.1", type=str, help="Name of the speaker diarization model to use")
+    parser.add_argument("--speaker_embeddings", action="store_true", help="Include speaker embeddings in JSON output (only works with --diarize)")
 
     parser.add_argument("--temperature", type=float, default=0, help="temperature to use for sampling")
     parser.add_argument("--best_of", type=optional_int, default=5, help="number of candidates when sampling with non-zero temperature")

whisperx/diarize.py

@@ -1,7 +1,7 @@
 import numpy as np
 import pandas as pd
 from pyannote.audio import Pipeline
-from typing import Optional, Union
+from typing import Optional, Union, Tuple, Dict, List, Any
 import torch
 
 from whisperx.audio import load_audio, SAMPLE_RATE
@@ -26,25 +26,81 @@ class DiarizationPipeline:
         num_speakers: Optional[int] = None,
         min_speakers: Optional[int] = None,
         max_speakers: Optional[int] = None,
-    ):
+        return_embeddings: bool = False,
+    ) -> Union[Tuple[pd.DataFrame, Optional[Dict[str, List[float]]]], pd.DataFrame]:
+        """
+        Perform speaker diarization on audio.
+        
+        Args:
+            audio: Path to audio file or audio array
+            num_speakers: Exact number of speakers (if known)
+            min_speakers: Minimum number of speakers to detect
+            max_speakers: Maximum number of speakers to detect
+            return_embeddings: Whether to return speaker embeddings
+            
+        Returns:
+            If return_embeddings is True: 
+                Tuple of (diarization dataframe, speaker embeddings dictionary)
+            Otherwise:
+                Just the diarization dataframe
+        """
         if isinstance(audio, str):
             audio = load_audio(audio)
         audio_data = {
             'waveform': torch.from_numpy(audio[None, :]),
             'sample_rate': SAMPLE_RATE
         }
-        segments = self.model(audio_data, num_speakers = num_speakers, min_speakers=min_speakers, max_speakers=max_speakers)
-        diarize_df = pd.DataFrame(segments.itertracks(yield_label=True), columns=['segment', 'label', 'speaker'])
+
+        if return_embeddings:
+            diarization, embeddings = self.model(
+                audio_data, 
+                num_speakers=num_speakers,
+                min_speakers=min_speakers, 
+                max_speakers=max_speakers, 
+                return_embeddings=True
+            )
+        else:
+            diarization = self.model(
+                audio_data, 
+                num_speakers=num_speakers,
+                min_speakers=min_speakers, 
+                max_speakers=max_speakers
+            )
+            embeddings = None
+
+        diarize_df = pd.DataFrame(diarization.itertracks(yield_label=True), columns=['segment', 'label', 'speaker'])
         diarize_df['start'] = diarize_df['segment'].apply(lambda x: x.start)
         diarize_df['end'] = diarize_df['segment'].apply(lambda x: x.end)
-        return diarize_df
+
+        if return_embeddings and embeddings is not None:
+            speaker_embeddings = {speaker: embeddings[s].tolist() for s, speaker in enumerate(diarization.labels())}
+            return diarize_df, speaker_embeddings
+        
+        # For backwards compatibility
+        if return_embeddings:
+            return diarize_df, None
+        else:
+            return diarize_df
 
 
 def assign_word_speakers(
     diarize_df: pd.DataFrame,
     transcript_result: Union[AlignedTranscriptionResult, TranscriptionResult],
-    fill_nearest=False,
-) -> dict:
+    speaker_embeddings: Optional[Dict[str, List[float]]] = None,
+    fill_nearest: bool = False,
+) -> Union[AlignedTranscriptionResult, TranscriptionResult]:
+    """
+    Assign speakers to words and segments in the transcript.
+    
+    Args:
+        diarize_df: Diarization dataframe from DiarizationPipeline
+        transcript_result: Transcription result to augment with speaker labels
+        speaker_embeddings: Optional dictionary mapping speaker IDs to embedding vectors
+        fill_nearest: If True, assign speakers even when there's no direct time overlap
+        
+    Returns:
+        Updated transcript_result with speaker assignments and optionally embeddings
+    """
     transcript_segments = transcript_result["segments"]
     for seg in transcript_segments:
         # assign speaker to segment (if any)
@@ -75,7 +131,11 @@ def assign_word_speakers(
                         # sum over speakers
                         speaker = dia_tmp.groupby("speaker")["intersection"].sum().sort_values(ascending=False).index[0]
                         word["speaker"] = speaker
-        
+    
+    # Add speaker embeddings to the result if provided
+    if speaker_embeddings is not None:
+        transcript_result["speaker_embeddings"] = speaker_embeddings
+    
     return transcript_result            
 
 

whisperx/transcribe.py

@@ -59,6 +59,10 @@ def transcribe_task(args: dict, parser: argparse.ArgumentParser):
     max_speakers: int = args.pop("max_speakers")
     diarize_model_name: str = args.pop("diarize_model")
     print_progress: bool = args.pop("print_progress")
+    return_speaker_embeddings: bool = args.pop("speaker_embeddings")
+
+    if return_speaker_embeddings and not diarize:
+        warnings.warn("--speaker_embeddings has no effect without --diarize")
 
     if args["language"] is not None:
         args["language"] = args["language"].lower()
@@ -209,10 +213,13 @@ def transcribe_task(args: dict, parser: argparse.ArgumentParser):
         results = []
         diarize_model = DiarizationPipeline(model_name=diarize_model_name, use_auth_token=hf_token, device=device)
         for result, input_audio_path in tmp_results:
-            diarize_segments = diarize_model(
-                input_audio_path, min_speakers=min_speakers, max_speakers=max_speakers
+            diarize_segments, speaker_embeddings = diarize_model(
+                input_audio_path, 
+                min_speakers=min_speakers, 
+                max_speakers=max_speakers, 
+                return_embeddings=return_speaker_embeddings
             )
-            result = assign_word_speakers(diarize_segments, result)
+            result = assign_word_speakers(diarize_segments, result, speaker_embeddings)
             results.append((result, input_audio_path))
     # >> Write
     for result, audio_path in results: