[`generate`] fix breaking change for patch (#29976)

* fix bug and add tests

* nit

* otherway to get the cur len instead of attention mask

* more places where this might have been broken

* nit

* oups

* inputs_embeds vs input_embeds

* test generated outptus

* style

* nit

* fix

* skip failing biogpt

src/transformers/generation/utils.py

@@ -3034,6 +3034,8 @@ class GenerationMixin:
         num_beams = beam_scorer.num_beams
 
         batch_beam_size, cur_len = input_ids.shape
+        if "inputs_embeds" in model_kwargs:
+            cur_len = model_kwargs["inputs_embeds"].shape[1]
         model_kwargs["cache_position"] = torch.arange(cur_len, device=input_ids.device)
 
         if num_beams * batch_size != batch_beam_size:
@@ -3437,6 +3439,8 @@ class GenerationMixin:
         num_beams = beam_scorer.num_beams
 
         batch_beam_size, cur_len = input_ids.shape
+        if "inputs_embeds" in model_kwargs:
+            cur_len = model_kwargs["inputs_embeds"].shape[1]
         model_kwargs["cache_position"] = torch.arange(cur_len, device=input_ids.device)
 
         # init attention / hidden states / scores tuples
@@ -3795,6 +3799,8 @@ class GenerationMixin:
         device = input_ids.device
 
         batch_beam_size, cur_len = input_ids.shape
+        if "inputs_embeds" in model_kwargs:
+            cur_len = model_kwargs["inputs_embeds"].shape[1]
         model_kwargs["cache_position"] = torch.arange(cur_len, device=input_ids.device)
 
         if return_dict_in_generate and output_scores:
@@ -4211,6 +4217,8 @@ class GenerationMixin:
         num_beams = constrained_beam_scorer.num_beams
 
         batch_beam_size, cur_len = input_ids.shape
+        if "inputs_embeds" in model_kwargs:
+            cur_len = model_kwargs["inputs_embeds"].shape[1]
         model_kwargs["cache_position"] = torch.arange(cur_len, device=input_ids.device)
 
         if num_beams * batch_size != batch_beam_size:

tests/generation/test_utils.py

@@ -717,6 +717,19 @@ class GenerationTesterMixin:
             )
 
             self.assertTrue(output_generate.shape[-1] == max_length)
+            if "inputs_embeds" in set(inspect.signature(model.prepare_inputs_for_generation).parameters):
+                input_embeds = model.get_input_embeddings()(input_ids)
+                beam_kwargs.update({"inputs_embeds": input_embeds})
+                output_generate2 = self._beam_sample_generate(
+                    model=model,
+                    input_ids=None,
+                    attention_mask=attention_mask,
+                    max_length=max_length,
+                    beam_kwargs=beam_kwargs,
+                    logits_warper_kwargs=logits_warper_kwargs,
+                )
+
+                torch.testing.assert_close(output_generate[:, input_embeds.shape[1] :], output_generate2)
 
     def test_beam_sample_generate_dict_output(self):
         for model_class in self.all_generative_model_classes:

tests/models/biogpt/test_modeling_biogpt.py

@@ -414,6 +414,10 @@ class BioGptModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTesterMix
         result = model(input_ids, attention_mask=attention_mask, labels=sequence_labels)
         self.assertEqual(result.logits.shape, (self.model_tester.batch_size, self.model_tester.num_labels))
 
+    @unittest.skip("The `input_embeds` when fed don't produce the same results.")
+    def test_beam_sample_generate(self):
+        pass
+
 
 @require_torch
 class BioGptModelIntegrationTest(unittest.TestCase):