From 1a0161f345191d78a19eec829f9d73b2c2c72f94 Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Sun, 16 Apr 2023 09:44:12 +0200
Subject: Update

---
 models/lora.py | 59 ++++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 37 insertions(+), 22 deletions(-)

(limited to 'models/lora.py')

diff --git a/models/lora.py b/models/lora.py
index 89c4b2e..b7fa58f 100644
--- a/models/lora.py
+++ b/models/lora.py
@@ -46,8 +46,8 @@ class LoraEmbedding(nn.Embedding, LoraLayer):
         self.trainable_ids -= 1
 
         if r > 0:
-            self.lora_A = nn.Parameter(self.weight.new_zeros((r, 0)))
-            self.lora_B = nn.Parameter(self.weight.new_zeros((embedding_dim, r)))
+            self.lora_A = nn.ParameterList()
+            self.lora_B = nn.Linear(r, embedding_dim, bias=False)
             self.scaling = self.lora_alpha / self.r
             self.weight.requires_grad = False
 
@@ -83,49 +83,64 @@ class LoraEmbedding(nn.Embedding, LoraLayer):
         if new_ids.shape[0] == 0:
             return
 
-        n1 = self.lora_A.shape[1]
+        n1 = len(self.lora_A)
         n2 = n1 + new_ids.shape[0]
         self.trainable_ids[new_ids] = torch.arange(n1, n2)
+        for _ in new_ids:
+            self.lora_A.append(self.weight.new_zeros(self.r))
+
+    def persist(self):
+        if self.r > 0:
+            weights, mask = self.get_weights(torch.arange(self.trainable_ids.shape[0]))
+            if weights is not None:
+                self.weight[mask].data += weights
+                self.trainable_ids[:] = -1
+                self.lora_A = nn.ParameterList()
+
+    def get_weights(self, input_ids: torch.Tensor):
+        trainable_ids = self.trainable_ids[input_ids]
+        mask = ~(trainable_ids == -1)
+        trainable_ids = trainable_ids[mask]
+
+        elems = [self.lora_A[id] for id in trainable_ids]
+
+        if len(elems) == 0:
+            return None, mask
+
+        weights = self.lora_B(self.lora_dropout(torch.stack(elems))) * self.scaling
 
-        lora_A = nn.Parameter(self.weight.new_zeros((self.r, n2)))
-        self.lora_A = lora_A
+        return weights, mask
 
     def reset_parameters(self):
         nn.Embedding.reset_parameters(self)
         if hasattr(self, 'lora_A'):
-            nn.init.zeros_(self.lora_A)
-            nn.init.normal_(self.lora_B)
+            self.lora_A = nn.ParameterList()
+            nn.init.zeros_(self.lora_B.weight)
 
     def train(self, mode: bool = True):
         nn.Embedding.train(self, mode)
         if self.merge_weights and self.merged:
             if self.r > 0:
-                mask = ~(self.trainable_ids == -1)
-                trainable_ids = self.trainable_ids[mask]
-                self.weight[trainable_ids].data -= (self.lora_B @ self.lora_A).T * self.scaling
+                weights, mask = self.get_weights(torch.arange(self.trainable_ids.shape[0]))
+                if weights is not None:
+                    self.weight[mask].data -= weights
             self.merged = False
 
     def eval(self):
         nn.Embedding.eval(self)
         if self.merge_weights and not self.merged:
             if self.r > 0:
-                mask = ~(self.trainable_ids == -1)
-                trainable_ids = self.trainable_ids[mask]
-                self.weight[trainable_ids].data += (self.lora_B @ self.lora_A) * self.scaling
+                weights, mask = self.get_weights(torch.arange(self.trainable_ids.shape[0]))
+                if weights is not None:
+                    self.weight[mask].data += weights
             self.merged = True
 
     def forward(self, input_ids: torch.Tensor):
         result = nn.Embedding.forward(self, input_ids)
 
         if self.r > 0 and not self.merged:
-            trainable_ids = self.trainable_ids[input_ids]
-            mask = ~(trainable_ids == -1)
-            trainable_ids = trainable_ids[mask]
-
-            after_A = F.embedding(
-                trainable_ids, self.lora_A.T, self.padding_idx, self.max_norm,
-                self.norm_type, self.scale_grad_by_freq, self.sparse
-            )
-            result[mask] += (after_A @ self.lora_B.T) * self.scaling
+            weights, mask = self.get_weights(input_ids)
+            if weights is not None:
+                result[mask] += weights
 
         return result
-- 
cgit v1.2.3-54-g00ecf