[Whisper] Deprecate forced ids for v4.39 (#29485)

deprecate old funcs

src/transformers/models/whisper/generation_whisper.py

@@ -25,7 +25,6 @@ from torch import nn
 
 from ...generation.configuration_utils import GenerationConfig
 from ...generation.logits_process import (
-    ForceTokensLogitsProcessor,
     LogitsProcessorList,
     SuppressTokensAtBeginLogitsProcessor,
     SuppressTokensLogitsProcessor,
@@ -539,11 +538,9 @@ class WhisperGenerationMixin:
             num_segment_frames=num_segment_frames,
             kwargs=kwargs,
         )
-        # TODO(Sanchit) - passing `decoder_input_ids` is deprecated. One should use `prompt_ids` instead
-        # This function should be be removed in v4.39
-        self._check_decoder_input_ids(
-            prompt_ids=prompt_ids, init_tokens=init_tokens, is_shortform=is_shortform, kwargs=kwargs
-        )
+        # passing `decoder_input_ids` is deprecated - the only exception is for assisted generation
+        # where the input ids are handled explicitly by the generate method
+        self._check_decoder_input_ids(kwargs=kwargs)
 
         # 3. Retrieve logits processors
         begin_index = len(init_tokens)
@@ -1129,15 +1126,13 @@ class WhisperGenerationMixin:
                 forced_decoder_ids = forced_decoder_ids[1:]
                 i += 1
 
-            # TODO(Sanchit): Let's make sure we don't allow incorrectly / weirdly formatted `forced_decoder_ids` after transformers v4.39
             if len(forced_decoder_ids) > 0:
-                warnings.warn(
-                    f"You are using token ids in `forced_decoder_ids` that do not seem to correctly follow the prompt pattern of Whisper. Make sure that {forced_decoder_ids} has an entry for all indices >= 1 and < {forced_decoder_ids[0][0]}. `forced_decoder_ids` will be passed as a logit processor, but note that this functionality has been deprecated and will throw an error in v4.39.",
-                    FutureWarning,
+                raise ValueError(
+                    f"You are using token ids in `forced_decoder_ids` that do not seem to correctly follow the prompt pattern of Whisper. Make sure that {forced_decoder_ids} has an entry for all indices >= 1 and < {forced_decoder_ids[0][0]}.",
                 )
 
-            # TODO(Sanchit): set generation_config.forced_decoder_ids to None for v4.39
-            generation_config.forced_decoder_ids = forced_decoder_ids if len(forced_decoder_ids) > 0 else None
+        # from v4.39 the forced decoder ids are always None in favour of decoder input ids
+        generation_config.forced_decoder_ids = None
 
         is_lang_id_undefined = len(init_tokens) <= 1 or (len(init_tokens) > 1 and init_tokens[1] is None)
         if language is not None:
@@ -1282,20 +1277,12 @@ class WhisperGenerationMixin:
         return lang_ids
 
     @staticmethod
-    def _check_decoder_input_ids(prompt_ids, init_tokens, is_shortform, kwargs):
+    def _check_decoder_input_ids(kwargs):
         decoder_input_ids = kwargs.get("decoder_input_ids", None)
-        if prompt_ids is not None and decoder_input_ids is not None:
+        assistant_model = kwargs.get("assistant_model", None)
+        if decoder_input_ids is not None and assistant_model is not None:
             raise ValueError(
-                f"Cannot pass both `prompt_ids`: {prompt_ids} and `decoder_input_ids`: {decoder_input_ids}. Passing `decoder_input_ids` is deprecated, consider not passing it."
-            )
-        elif decoder_input_ids is not None and not is_shortform:
-            raise ValueError(
-                f"Cannot pass both `decoder_input_ids`: {decoder_input_ids} for long-form generation. Consider passing `prompt_ids` instead."
-            )
-        elif decoder_input_ids is not None and is_shortform:
-            warnings.warn(
-                f"You have provided `decoder_input_ids` which will overwrite the `init_tokens` {init_tokens}. This might lead to unexpected behavior. Passing `decoder_input_ids` is deprecated and will be removed in v4.39. Consider passing `prompt_ids` instead.",
-                FutureWarning,
+                "Passing `decoder_input_ids` is deprecated. Consider passing `prompt_ids` instead.",
             )
 
     @staticmethod
@@ -1436,19 +1423,6 @@ class WhisperGenerationMixin:
             )
             no_speech_detector.set_model(self)
 
-        if is_shortform and generation_config.forced_decoder_ids is not None:
-            forced_tokens_proc = ForceTokensLogitsProcessor(generation_config.forced_decoder_ids)
-            # It's important that the `forced_tokens_proc` processor is appended after
-            # the suppress_tokens processor or else it might happen that all token logits are suppressed to -inf
-            # which would lead to unexpected behavior
-            # The better approach here is to NOT make use of the `forced_tokens_proc` for Whisper and instead
-            # initialize all of them as `decoder_input_ids`.
-            # TODO(Sanchit): Make sure to deprecate this in v4.39 as there will be no `forced_decoder_ids` anymore.
-            logits_processor = (
-                [forced_tokens_proc] if logits_processor is None else logits_processor + [forced_tokens_proc]
-            )
-            generation_config.forced_decoder_ids = None
-
         return logits_processor
 
     @staticmethod