Updated decode output cls (state-spaces#807)

Author: romitjain

mamba_ssm/utils/generation.py

@@ -11,7 +11,7 @@
 from einops import rearrange, repeat
 from torch import Tensor
 from torch.profiler import ProfilerActivity, profile, record_function
-from transformers.generation import GreedySearchDecoderOnlyOutput, SampleDecoderOnlyOutput, TextStreamer
+from transformers.generation import GenerateDecoderOnlyOutput, TextStreamer
 
 
 @dataclass
@@ -146,7 +146,7 @@ def decode(
         max_length: int
         teacher_outputs (optional): (batch, seq_len). If provided, instead of sampling from the
             logits, the next token is taken from the teacher_outputs. Useful for testing.
-    Returns: GreedySearchDecoderOnlyOutput or SampleDecoderOnlyOutput, with the following fields:
+    Returns: GenerateDecoderOnlyOutput, with the following fields:
         sequences: (batch, max_length)
         scores: tuples of (batch, vocab_size)
     """
@@ -240,8 +240,7 @@ def should_stop(current_token, inference_params):
         end.record()
         torch.cuda.synchronize()
         print(f"Prompt processing + decoding time: {(start.elapsed_time(end)):.0f}ms")
-    output_cls = GreedySearchDecoderOnlyOutput if top_k == 1 else SampleDecoderOnlyOutput
-    return output_cls(sequences=torch.cat(sequences, dim=1), scores=tuple(scores))
+    return GenerateDecoderOnlyOutput(sequences=torch.cat(sequences, dim=1), scores=tuple(scores))
 
 
 class GenerationMixin: