Generation tests: update imagegpt input name, remove unused functions (#33663)

tests/models/seamless_m4t/test_modeling_seamless_m4t.py

@@ -399,29 +399,6 @@ class SeamlessM4TModelWithSpeechInputTest(ModelTesterMixin, unittest.TestCase):
 
         return config, input_ids.float(), attention_mask, max_length
 
-    @staticmethod
-    def _get_encoder_outputs(
-        model, input_ids, attention_mask, output_attentions=None, output_hidden_states=None, num_interleave=1
-    ):
-        encoder = model.get_encoder()
-        encoder_outputs = encoder(
-            input_ids,
-            attention_mask=attention_mask,
-            output_attentions=output_attentions,
-            output_hidden_states=output_hidden_states,
-        )
-        encoder_outputs["last_hidden_state"] = encoder_outputs.last_hidden_state.repeat_interleave(
-            num_interleave, dim=0
-        )
-        generation_config = copy.deepcopy(model.generation_config)
-        model._prepare_special_tokens(generation_config)
-        input_ids = (
-            torch.zeros(input_ids.shape[:2], dtype=torch.int64, layout=input_ids.layout, device=input_ids.device)
-            + generation_config.decoder_start_token_id
-        )
-        attention_mask = None
-        return encoder_outputs, input_ids, attention_mask
-
     def test_initialization(self):
         config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()