[Chore] Remove Sampler from Model Code (#17084)

Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>

vllm/model_executor/models/qwen2.py

@@ -43,7 +43,6 @@ from vllm.model_executor.layers.logits_processor import LogitsProcessor
 from vllm.model_executor.layers.pooler import Pooler, PoolingType
 from vllm.model_executor.layers.quantization import QuantizationConfig
 from vllm.model_executor.layers.rotary_embedding import get_rope
-from vllm.model_executor.layers.sampler import SamplerOutput, get_sampler
 from vllm.model_executor.layers.vocab_parallel_embedding import (
     ParallelLMHead, VocabParallelEmbedding)
 from vllm.model_executor.model_loader.weight_utils import (
@@ -450,7 +449,6 @@ class Qwen2ForCausalLM(nn.Module, SupportsLoRA, SupportsPP):
             self.lm_head = PPMissingLayer()
 
         self.logits_processor = LogitsProcessor(config.vocab_size)
-        self.sampler = get_sampler()
 
         self.make_empty_intermediate_tensors = (
             self.model.make_empty_intermediate_tensors)
@@ -478,14 +476,6 @@ class Qwen2ForCausalLM(nn.Module, SupportsLoRA, SupportsPP):
                                        sampling_metadata)
         return logits
 
-    def sample(
-        self,
-        logits: torch.Tensor,
-        sampling_metadata: SamplingMetadata,
-    ) -> Optional[SamplerOutput]:
-        next_tokens = self.sampler(logits, sampling_metadata)
-        return next_tokens
-
     def load_weights(self, weights: Iterable[Tuple[str,
                                                    torch.Tensor]]) -> Set[str]:
         loader = AutoWeightsLoader(