Add e5-mistral modules [unreachable code] - step 1/3 (#983)

python/sglang/srt/models/llama_embedding.py

@@ -0,0 +1,86 @@
+from typing import Iterable, Optional, Tuple
+
+import torch
+from torch import nn
+from transformers import LlamaConfig
+from vllm.model_executor.model_loader.weight_utils import default_weight_loader
+
+from sglang.srt.layers.pooler import EmbeddingPoolerOutput, Pooler, PoolingType
+from sglang.srt.model_executor.model_runner import InputMetadata
+from sglang.srt.models.llama2 import LlamaForCausalLM, LlamaModel
+
+
+class LlamaEmbeddingModel(nn.Module):
+    def __init__(
+        self,
+        config: LlamaConfig,
+        quant_config=None,
+        cache_config=None,
+        efficient_weight_load=False,
+    ) -> None:
+        super().__init__()
+        self.model = LlamaModel(config, quant_config=quant_config)
+        self.pooler = Pooler(pooling_type=PoolingType.LAST, normalize=True)
+
+    @torch.no_grad()
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        positions: torch.Tensor,
+        input_metadata: InputMetadata,
+        input_embeds: torch.Tensor = None,
+    ) -> EmbeddingPoolerOutput:
+        hidden_states = self.model(input_ids, positions, input_metadata, input_embeds)
+        return self.pooler(hidden_states, input_metadata)
+
+    def load_weights(
+        self, weights: Iterable[Tuple[str, torch.Tensor]], name=None, loaded_weight=None
+    ):
+        stacked_params_mapping = [
+            # (param_name, shard_name, shard_id)
+            ("qkv_proj", "q_proj", "q"),
+            ("qkv_proj", "k_proj", "k"),
+            ("qkv_proj", "v_proj", "v"),
+            ("gate_up_proj", "gate_proj", 0),
+            ("gate_up_proj", "up_proj", 1),
+        ]
+        params_dict = dict(self.model.named_parameters())
+
+        def load_weights_per_param(name, loaded_weight):
+            if "rotary_emb.inv_freq" in name or "projector" in name:
+                return
+            if "rotary_emb.cos_cached" in name or "rotary_emb.sin_cached" in name:
+                # Models trained using ColossalAI may include these tensors in
+                # the checkpoint. Skip them.
+                return
+            for param_name, weight_name, shard_id in stacked_params_mapping:
+                if weight_name not in name:
+                    continue
+                name = name.replace(weight_name, param_name)
+                # Skip loading extra bias for GPTQ models.
+                if name.endswith(".bias") and name not in params_dict:
+                    continue
+                if name.startswith("model.vision_tower") and name not in params_dict:
+                    continue
+                param = params_dict[name]
+                weight_loader = param.weight_loader
+                weight_loader(param, loaded_weight, shard_id)
+                break
+            else:
+                # Skip loading extra bias for GPTQ models.
+                if name.endswith(".bias") and name not in params_dict:
+                    return
+                if name.startswith("model.vision_tower") and name not in params_dict:
+                    return
+                param = params_dict[name]
+                weight_loader = getattr(param, "weight_loader", default_weight_loader)
+                weight_loader(param, loaded_weight)
+
+        if name is None or loaded_weight is None:
+            for name, loaded_weight in weights:
+                load_weights_per_param(name, loaded_weight)
+        else:
+            load_weights_per_param(name, loaded_weight)
+
+
+EntryClass = LlamaEmbeddingModel