Added validator for timestamps parameter

handler.py

@@ -3,6 +3,7 @@ from typing import Dict, List, Any, Literal, Optional, Tuple
 import torch
 import logging
 from pydantic_settings import BaseSettings
+from pydantic import field_validator
 
 class EndpointHandler():
     def __init__(self, path=""):
@@ -63,6 +64,13 @@ class WhisperParameterHandler(BaseSettings):
     no_speech_threshold: Optional[float] = None
     return_timestamps: Optional[Literal["word", True]] = None
 
+    @field_validator("return_timestamps", mode="before")
+    def cannonize_timestamps(cls, value: Any):
+        if value == "True":
+            return True
+        
+        return value
+    
     model_config = {
         "env_prefix": "WHISPER_KWARGS_",
         "case_sensitive": False,