updates doc for transcription.py

Signed-off-by: Nithin Rao Koluguri <nithinraok>

nemo/collections/asr/parts/mixins/transcription.py

@@ -60,7 +60,7 @@ class TranscribeConfig:
     num_workers: Optional[int] = None
     channel_selector: ChannelSelectorType = None
     augmentor: Optional[DictConfig] = None
-    timestamps: bool = False  # returns timestamps for each word and segments if model supports punctuations
+    timestamps: Optional[bool] = None  # returns timestamps for each word and segments if model supports punctuations
     verbose: bool = True
 
     # Utility
@@ -179,7 +179,7 @@ def transcribe(
         channel_selector: Optional[ChannelSelectorType] = None,
         augmentor: DictConfig = None,
         verbose: bool = True,
-        timestamps: bool = False,
+        timestamps: Optional[bool] = None,
         override_config: Optional[TranscribeConfig] = None,
         **config_kwargs,
     ) -> GenericTranscriptionType:
@@ -201,6 +201,7 @@ def transcribe(
                 to `None`. Defaults to `None`. Uses zero-based indexing.
             augmentor: (DictConfig): Augment audio samples during transcription if augmentor is applied.
             verbose: (bool) whether to display tqdm progress bar
+            timestamps: Optional(Bool): timestamps will be returned if set to True as part of hypothesis object (output.timestep['segment']/output.timestep['word']). Refer to `Hypothesis` class for more details. Default is None and would retain the previous state set by using self.change_decoding_strategy().
             override_config: (Optional[TranscribeConfig]) override transcription config pre-defined by the user.
                 **Note**: All other arguments in the function will be ignored if override_config is passed.
                 You should call this argument as `model.transcribe(audio, override_config=TranscribeConfig(...))`.