add disk embedding (#11543)

python/llm/src/ipex_llm/transformers/embedding.py

@@ -15,6 +15,7 @@
 #
 
 
+import numpy
 import torch
 from torch import Tensor
 from torch.nn import functional as F
@@ -68,14 +69,56 @@ class LLMEmbedding(torch.nn.Embedding):
                  _freeze: bool = False,
                  device=None, dtype=None) -> None:
         super().__init__(num_embeddings, embedding_dim, padding_idx,
-                         max_norm, norm_type, scale_grad_by_freq, sparse,
-                         _weight, device, dtype)
+                         max_norm, norm_type, scale_grad_by_freq,
+                         sparse, _weight, _freeze, device, dtype)
         self.weight = CPUPinnedParam(self.weight.data, requires_grad=not _freeze)
 
     def forward(self, x: Tensor):
         return super().forward(x.to('cpu')).to(x.device)
 
 
+class DiskEmbedding(torch.nn.Embedding):
+    def __init__(self,
+                 num_embeddings: int,
+                 embedding_dim: int,
+                 padding_idx: Optional[int] = None,
+                 max_norm: Optional[float] = None,
+                 norm_type: float = 2.,
+                 scale_grad_by_freq: bool = False,
+                 sparse: bool = False,
+                 _weight: Optional[Tensor] = None,
+                 _freeze: bool = False,
+                 device=None, dtype=None) -> None:
+        super().__init__(num_embeddings, embedding_dim, padding_idx,
+                         max_norm, norm_type, scale_grad_by_freq,
+                         sparse, _weight, _freeze, device, dtype)
+        self.filename = "embeddings.bin"
+        self.weight.data.flatten().half().numpy().tofile(self.filename)
+        dummy_weight = torch.empty(0, 0, dtype=self.weight.dtype, device=self.weight.device)
+        self.weight = torch.nn.Parameter(dummy_weight, requires_grad=False)
+
+    def forward(self, input_ids: Tensor):
+        ids = input_ids.cpu().flatten()
+
+        embeds = []
+        with open(self.filename, 'rb') as f:
+            for idx in ids:
+                f.seek(idx * self.embedding_dim * 2)
+                buffer = f.read(self.embedding_dim * 2)
+                embeds.append(torch.frombuffer(buffer, dtype=torch.half))
+        embeds = torch.stack(embeds).to(device=input_ids.device, dtype=self.weight.dtype)
+        return embeds.view(*input_ids.size(), self.embedding_dim)
+
+    def restore(self):
+        with open(self.filename, 'rb') as f:
+            buffer = f.read()
+        embeds = torch.frombuffer(buffer, dtype=torch.half).clone()
+        embeds = embeds.view(self.num_embeddings, self.embedding_dim).to(
+            device=self.weight.device, dtype=self.weight.dtype
+        )
+        self.weight = torch.nn.Parameter(embeds, requires_grad=False)
+
+
 class LowBitEmbedding(torch.nn.Embedding):
     def __init__(self,
                  num_embeddings: int,