[Model] Pipeline parallel support for JAIS (#7603)

vllm/config.py

@@ -36,6 +36,7 @@ _PP_SUPPORTED_MODELS = [
     "AquilaForCausalLM",
     "DeepseekV2ForCausalLM",
     "InternLMForCausalLM",
+    "JAISLMHeadModel",
     "LlamaForCausalLM",
     "LLaMAForCausalLM",
     "MistralForCausalLM",

vllm/model_executor/models/jais.py

@@ -20,14 +20,14 @@
 """Inference-only Jais model compatible with HuggingFace weights."""
 
 import math
-from typing import Iterable, List, Optional, Tuple
+from typing import Iterable, List, Optional, Tuple, Union
 
 import torch
 from torch import nn
 
 from vllm.attention import Attention, AttentionMetadata
 from vllm.config import CacheConfig
-from vllm.distributed import (get_tensor_model_parallel_rank,
+from vllm.distributed import (get_pp_group, get_tensor_model_parallel_rank,
                               get_tensor_model_parallel_world_size)
 from vllm.model_executor.layers.linear import (ColumnParallelLinear,
                                                QKVParallelLinear,
@@ -43,6 +43,8 @@ from vllm.model_executor.sampling_metadata import SamplingMetadata
 from vllm.sequence import IntermediateTensors, SamplerOutput
 from vllm.transformers_utils.configs import JAISConfig
 
+from .utils import is_pp_missing_parameter, make_layers
+
 
 class SwiGLUActivation(nn.Module):
 
@@ -216,6 +218,7 @@ class JAISModel(nn.Module):
         config: JAISConfig,
         cache_config: Optional[CacheConfig] = None,
         quant_config: Optional[QuantizationConfig] = None,
+        prefix: str = "",
     ):
         super().__init__()
         self.config = config
@@ -231,10 +234,15 @@ class JAISModel(nn.Module):
             self.embeddings_scale = config.embeddings_scale
         else:
             self.embeddings_scale = config.mup_embeddings_scale
-        self.h = nn.ModuleList([
-            JAISBlock(config, cache_config, quant_config)
-            for _ in range(config.num_hidden_layers)
-        ])
+
+        self.start_layer, self.end_layer, self.h = make_layers(
+            config.num_hidden_layers,
+            lambda prefix: JAISBlock(config=config,
+                                     cache_config=cache_config,
+                                     quant_config=quant_config),
+            prefix=f"{prefix}.h",
+        )
+
         self.ln_f = nn.LayerNorm(self.embed_dim, eps=config.layer_norm_epsilon)
 
     def forward(
@@ -243,7 +251,9 @@ class JAISModel(nn.Module):
         position_ids: torch.Tensor,
         kv_caches: List[torch.Tensor],
         attn_metadata: AttentionMetadata,
-    ) -> torch.Tensor:
+        intermediate_tensors: Optional[IntermediateTensors] = None,
+    ) -> Union[IntermediateTensors, torch.Tensor]:
+        if get_pp_group().is_first_rank:
             inputs_embeds = self.wte(input_ids)
             if self.wpe is not None:
                 position_embeds = self.wpe(position_ids)
@@ -252,10 +262,18 @@ class JAISModel(nn.Module):
                 hidden_states = inputs_embeds
             hidden_states *= torch.tensor(float(self.embeddings_scale),
                                           dtype=hidden_states.dtype)
+        else:
+            assert intermediate_tensors is not None
+            hidden_states = intermediate_tensors["hidden_states"]
 
-        for i in range(len(self.h)):
+        for i in range(self.start_layer, self.end_layer):
             layer = self.h[i]
-            hidden_states = layer(hidden_states, kv_caches[i], attn_metadata)
+            hidden_states = layer(hidden_states,
+                                  kv_caches[i - self.start_layer],
+                                  attn_metadata)
+
+        if not get_pp_group().is_last_rank:
+            return IntermediateTensors({"hidden_states": hidden_states})
 
         hidden_states = self.ln_f(hidden_states)
         return hidden_states
@@ -290,9 +308,9 @@ class JAISLMHeadModel(nn.Module):
         kv_caches: List[torch.Tensor],
         attn_metadata: AttentionMetadata,
         intermediate_tensors: Optional[IntermediateTensors] = None,
-    ) -> torch.Tensor:
+    ) -> Union[IntermediateTensors, torch.Tensor]:
         hidden_states = self.transformer(input_ids, positions, kv_caches,
-                                         attn_metadata)
+                                         attn_metadata, intermediate_tensors)
         return hidden_states
 
     def compute_logits(
@@ -304,6 +322,16 @@ class JAISLMHeadModel(nn.Module):
                                        sampling_metadata)
         return logits
 
+    def make_empty_intermediate_tensors(
+            self, batch_size: int, dtype: torch.dtype,
+            device: torch.device) -> IntermediateTensors:
+        return IntermediateTensors({
+            "hidden_states":
+            torch.zeros((batch_size, self.config.hidden_size),
+                        dtype=dtype,
+                        device=device),
+        })
+
     def sample(
         self,
         logits: torch.Tensor,
@@ -327,6 +355,10 @@ class JAISLMHeadModel(nn.Module):
                 continue
             if not name.startswith("transformer."):
                 name = "transformer." + name
+
+            if is_pp_missing_parameter(name, self):
+                continue
+
             param = params_dict[name]
             # The HF's GPT-2 implementation uses Conv1D instead of Linear.
             # Because of this, we need to transpose the weights.