From 8161559d3529f164939ba9a41dfc9c6dfc8c4be2 Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Fri, 23 Dec 2022 12:09:29 +0100
Subject: Simplified trainable embedding code again

---
 training/ti.py | 25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

(limited to 'training')

diff --git a/training/ti.py b/training/ti.py
index 2e5139a..a5e407b 100644
--- a/training/ti.py
+++ b/training/ti.py
@@ -25,12 +25,10 @@ class TrainableEmbeddings(CLIPTextEmbeddings):
     def __init__(self, config: CLIPTextConfig, new_ids: list[int]):
         super().__init__(config)
 
-        self.id_mapping = {new_ids[i]: i for i in range(len(new_ids))}
-
         self.train_indices = torch.tensor(new_ids)
 
-        self.trainable_embedding = nn.Embedding(len(new_ids), self.token_embedding.embedding_dim)
-        self.trainable_embedding.weight.data = self.token_embedding.weight.data[self.train_indices]
+        self.trainable_embedding = nn.Embedding(self.token_embedding.num_embeddings, self.token_embedding.embedding_dim)
+        self.trainable_embedding.weight.data = self.token_embedding.weight.data.clone()
         self.trainable_embedding.weight.requires_grad = True
 
     def forward(
@@ -39,27 +37,16 @@ class TrainableEmbeddings(CLIPTextEmbeddings):
         position_ids: Optional[torch.LongTensor] = None,
         inputs_embeds: Optional[torch.FloatTensor] = None,
     ) -> torch.Tensor:
+        device = input_ids.device
         seq_length = input_ids.shape[-1] if input_ids is not None else inputs_embeds.shape[-2]
 
         if position_ids is None:
             position_ids = self.position_ids[:, :seq_length]
 
         if inputs_embeds is None:
-            mask = torch.isin(input_ids, self.train_indices.to(input_ids.device))[:, :, None]
-
-            trainable_input_ids = torch.tensor([
-                [
-                    self.id_mapping[id] if id in self.id_mapping else 0
-                    for id in batch
-                ]
-                for batch in input_ids
-            ], device=input_ids.device)
-
-            inputs_embeds = torch.where(
-                mask,
-                self.trainable_embedding(trainable_input_ids),
-                self.token_embedding(input_ids)
-            )
+            mask = torch.isin(input_ids, self.train_indices.to(device))
+            inputs_embeds = self.token_embedding(input_ids)
+            inputs_embeds[mask] = self.trainable_embedding(input_ids)[mask]
 
         position_embeddings = self.position_embedding(position_ids)
         embeddings = inputs_embeds + position_embeddings
-- 
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