fix merge lora error

lora_mixin.py

 """
-In this mixin, I use a different implementation than lora.py
+In this mixin, I use a different implementation than sat/model/finetune/lora.py
 I just use a fake linear layer to replace any model with lora mixin.
 """
 
@@ -17,6 +17,20 @@ class HackLinear(nn.Linear):
         if prefix + 'bias' in state_dict:
             self.bias.data.copy_(state_dict[prefix+'bias'])
 
+class HackRowParallelLinear(RowParallelLinear):
+    def _load_from_state_dict(self, state_dict, prefix, local_metadata, strict, missing_keys, unexpected_keys, error_msgs):
+        if prefix + 'weight' in state_dict:
+            self.weight.data.copy_(state_dict[prefix+'weight'])
+        if prefix + 'bias' in state_dict:
+            self.bias.data.copy_(state_dict[prefix+'bias'])
+
+class HackColumnParallelLinear(ColumnParallelLinear):
+    def _load_from_state_dict(self, state_dict, prefix, local_metadata, strict, missing_keys, unexpected_keys, error_msgs):
+        if prefix + 'weight' in state_dict:
+            self.weight.data.copy_(state_dict[prefix+'weight'])
+        if prefix + 'bias' in state_dict:
+            self.bias.data.copy_(state_dict[prefix+'bias'])
+
 try:
     from bitsandbytes.nn import LinearNF4
     def copy_nested_list(src, dst):
@@ -48,40 +62,14 @@ class HackParameterList(nn.ParameterList):
             if prefix + str(i) in state_dict:
                 self[i].data.copy_(state_dict[prefix+str(i)])
 
-class LoraLinear(nn.Module):
-    def __init__(self, in_dim, out_dim, r, lora_alpha=1., lora_dropout=0., qlora=False):
-        super().__init__()
-        if lora_dropout and lora_dropout > 0:
-            self.lora_dropout = nn.Dropout(p=lora_dropout)
-        else:
-            self.lora_dropout = lambda x: x
-        self.r = r
-        self.lora_alpha = lora_alpha
-        self.scaling = self.lora_alpha / self.r
-        if qlora:
-            self.original = HackLinearNF4(in_dim, out_dim)
-        else:
-            self.original = HackLinear(in_dim, out_dim)
-        self.matrix_A = nn.Parameter(torch.empty((r, in_dim)))
-        self.matrix_B = nn.Parameter(torch.empty((out_dim, r)))
-        nn.init.kaiming_uniform_(self.matrix_A, a=math.sqrt(5))
-        nn.init.zeros_(self.matrix_B)
-
-    def _load_from_state_dict(self, state_dict, prefix, local_metadata, strict, missing_keys, unexpected_keys, error_msgs):
-        # This is not a perfect version, becuase it doesn't handle errors and unexpected keys.
-        if prefix + 'weight' in state_dict:
-            # load from normal Linear
-            self.original._load_from_state_dict(state_dict, prefix, local_metadata, strict, missing_keys, unexpected_keys, error_msgs)
-        else:
-            # load from LoraLinear
-            super()._load_from_state_dict(state_dict, prefix, local_metadata, strict, missing_keys, unexpected_keys, error_msgs)
+map_cls = {
+    nn.Linear: (HackLinear, {}),
+    ColumnParallelLinear: (HackColumnParallelLinear, {'gather_output': False}),
+    RowParallelLinear: (HackRowParallelLinear, {'input_is_parallel': True})
+}
 
-    def forward(self, x):
-        return self.original(x) + (self.lora_dropout(x) @ self.matrix_A.T @ self.matrix_B.T) * self.scaling
-
-
-class LoraQKV(nn.Module):
-    def __init__(self, in_dim, out_dim, r, lora_alpha=1., lora_dropout=0., head_first=False, num_attention_heads=None, hidden_size_per_attention_head=None, qlora=False):
+class LoraLinear(nn.Module):
+    def __init__(self, original_cls, partition, in_dim, out_dim, r, lora_alpha=1., lora_dropout=0., head_first=False, num_attention_heads=None, hidden_size_per_attention_head=None, qlora=False):
         """
         You can use safely with this layer, ONLY WHEN query_key_value output is query_key_value order.
         If you use a different order like ChatGLM
@@ -95,15 +83,20 @@ class LoraQKV(nn.Module):
         self.lora_alpha = lora_alpha
         self.scaling = self.lora_alpha / self.r
         if qlora:
+            try:
                 self.original = HackLinearNF4(in_dim, out_dim)
+            except:
+                raise Exception('Build 4bit layer failed. You need to install the latest bitsandbytes. Try `pip install bitsandbytes`. If you still meet error after installation, try running `from bitsandbytes.nn import LinearNF4` with python and fix the error.')
         else:
-            self.original = HackLinear(in_dim, out_dim)
-        self.matrix_A = HackParameterList([nn.Parameter(torch.empty((r, in_dim))) for _ in range(3)])
-        self.matrix_B = HackParameterList([nn.Parameter(torch.empty((out_dim // 3, r))) for _ in range(3)])
-        for i in range(3):
+            base_cls, kwargs = map_cls[original_cls]
+            self.original = base_cls(in_dim, out_dim, **kwargs)
+        self.matrix_A = HackParameterList([nn.Parameter(torch.empty((r, in_dim))) for _ in range(partition)])
+        self.matrix_B = HackParameterList([nn.Parameter(torch.empty((out_dim // partition, r))) for _ in range(partition)])
+        for i in range(partition):
             nn.init.kaiming_uniform_(self.matrix_A[i], a=math.sqrt(5))
             nn.init.zeros_(self.matrix_B[i])
         self.head_first = head_first
+        self.partition = partition
         if head_first:
             assert num_attention_heads is not None and hidden_size_per_attention_head is not None, "You should set num_attention_heads and hidden_size_per_attention_head if you use head_first=True!"
             self.num_attention_heads = num_attention_heads
@@ -121,14 +114,14 @@ class LoraQKV(nn.Module):
     def forward(self, x):
         mixed_raw_layer = self.original(x)
         lora_outputs = []
-        for i in range(3):
+        for i in range(self.partition):
             lora_outputs.append((self.lora_dropout(x) @ self.matrix_A[i].T @ self.matrix_B[i].T) * self.scaling)
         if self.head_first:
             new_tensor_shape = lora_outputs[0].size()[:-1] + (
                 self.num_attention_heads,
                 self.hidden_size_per_attention_head,
             )
-            for i in range(3):
+            for i in range(self.partition):
                 lora_outputs[i] = lora_outputs[i].view(*new_tensor_shape)
             mixed_raw_layer = mixed_raw_layer + torch.cat(lora_outputs, -1).view(*mixed_raw_layer.size())
         else:
@@ -137,33 +130,35 @@ class LoraQKV(nn.Module):
         return mixed_raw_layer
 
 
-def replace_linear_with_lora(lin, base_cls, r, *args, **kw_args):
+def replace_linear_with_lora(lin, partition, r, *args, **kw_args):
     # not supported for linear without bias for now
     out_dim, in_dim = lin.weight.shape
-    return base_cls(in_dim, out_dim, r, *args, **kw_args)
+    original_cls = type(lin)
+    del lin
+    return LoraLinear(original_cls, partition, in_dim, out_dim, r, *args, **kw_args)
 
 def merge_linear_lora(lin):
-    out_dim, in_dim = lin.original.weight.shape
-    new_lin = nn.Linear(in_dim, out_dim)
-    new_lin.bias.data = lin.original.bias.data
-    new_lin.weight.data = lin.original.weight.data + (lin.matrix_A.data.T.float() @ lin.matrix_B.data.T.float() * lin.scaling).T.to(lin.original.weight.data.dtype)
-    return new_lin
-
-def merge_qkv_lora(lin):
-    out_dim, in_dim = lin.original.weight.shape
+    if lin.original.weight.data.dtype is not torch.uint8:
+        weight = lin.original.weight
+        out_dim, in_dim = weight.shape
         new_lin = nn.Linear(in_dim, out_dim)
+    else:
+        import bitsandbytes.functional as F
+        weight = F.dequantize_fp4(lin.original.weight.data, lin.original.weight.quant_state).to(lin.original.bias.data.dtype)
+        out_dim, in_dim = weight.shape
+        new_lin = HackLinearNF4(in_dim, out_dim)
     new_lin.bias.data = lin.original.bias.data
     new_qkv = []
-    for i in range(3):
+    for i in range(lin.partition):
         new_qkv.append(lin.matrix_A[i].data.T.float() @ lin.matrix_B[i].data.T.float() * lin.scaling)
     if lin.head_first:
         ini_shape = new_qkv[0].shape
         new_qkv = [x.view(ini_shape[0], lin.num_attention_heads, -1) for x in new_qkv]
-        new_qkv = torch.cat(new_qkv, -1).view(ini_shape[0], 3*ini_shape[1])
+        new_qkv = torch.cat(new_qkv, -1).view(ini_shape[0], lin.partition*ini_shape[1])
     else:
         new_qkv = torch.cat(new_qkv, -1)
-    new_lin.weight.data = lin.original.weight.data + new_qkv.T.to(lin.original.weight.data.dtype)
-    return new_lin
+    new_lin.weight.data = weight + new_qkv.T.to(lin.original.bias.data.dtype)
+    return new_lin.cuda() if torch.cuda.is_available() else new_lin
 
 class LoraMixin(BaseMixin):
     def __init__(self, 
@@ -175,7 +170,8 @@ class LoraMixin(BaseMixin):
                 head_first = False,
                 num_attention_heads = None,
                 hidden_size_per_attention_head = None,
-                qlora = False):
+                qlora = False,
+                cross_attention = True):
         super().__init__()
         self.r = r
         self.lora_alpha = lora_alpha
@@ -190,16 +186,18 @@ class LoraMixin(BaseMixin):
         self.num_attention_heads = num_attention_heads
         self.hidden_size_per_attention_head = hidden_size_per_attention_head
         self.qlora = qlora
+        self.cross_attention = cross_attention
 
     def reinit(self, parent_model):
-        """
-        only support self-attention part
-        not supported for cross-attention for now
-        """
         for i in self.layer_range:
-            print(f'replacing layer {i} with lora')
-            parent_model.transformer.layers[i].attention.dense = replace_linear_with_lora(parent_model.transformer.layers[i].attention.dense, LoraLinear, self.r, self.lora_alpha, self.lora_dropout, self.qlora)
-            parent_model.transformer.layers[i].attention.query_key_value = replace_linear_with_lora(parent_model.transformer.layers[i].attention.query_key_value, LoraQKV, self.r, self.lora_alpha, self.lora_dropout, head_first=self.head_first, num_attention_heads=self.num_attention_heads, hidden_size_per_attention_head=self.hidden_size_per_attention_head, qlora=self.qlora)
+            print(f'replacing layer {i} attention with lora')
+            parent_model.transformer.layers[i].attention.dense = replace_linear_with_lora(parent_model.transformer.layers[i].attention.dense, 1, self.r, self.lora_alpha, self.lora_dropout, qlora=self.qlora)
+            parent_model.transformer.layers[i].attention.query_key_value = replace_linear_with_lora(parent_model.transformer.layers[i].attention.query_key_value, 3, self.r, self.lora_alpha, self.lora_dropout, head_first=self.head_first, num_attention_heads=self.num_attention_heads, hidden_size_per_attention_head=self.hidden_size_per_attention_head, qlora=self.qlora)
+            if self.cross_attention and parent_model.transformer.layers[i].is_decoder:
+                print(f'replacing layer {i} cross attention with lora')
+                parent_model.transformer.layers[i].cross_attention.dense = replace_linear_with_lora(parent_model.transformer.layers[i].cross_attention.dense, 1, self.r, self.lora_alpha, self.lora_dropout, qlora=self.qlora)
+                parent_model.transformer.layers[i].cross_attention.query = replace_linear_with_lora(parent_model.transformer.layers[i].cross_attention.query, 1, self.r, self.lora_alpha, self.lora_dropout, qlora=self.qlora)
+                parent_model.transformer.layers[i].cross_attention.key_value = replace_linear_with_lora(parent_model.transformer.layers[i].cross_attention.key_value, 2, self.r, self.lora_alpha, self.lora_dropout, qlora=self.qlora)
         if self.qlora:
             print('replacing chatglm linear layer with 4bit')
             def replace_linear_with_nf4(model, name=None, cache={}):
@@ -229,9 +227,14 @@ class LoraMixin(BaseMixin):
 
     def merge_lora(self):
         for i in self.layer_range:
-            print(f'merge layer {i} lora back to linear')
+            print(f'merge layer {i} lora attention back to linear')
             self.transformer.layers[i].attention.dense = merge_linear_lora(self.transformer.layers[i].attention.dense)
-            self.transformer.layers[i].attention.query_key_value = merge_qkv_lora(self.transformer.layers[i].attention.query_key_value)
+            self.transformer.layers[i].attention.query_key_value = merge_linear_lora(self.transformer.layers[i].attention.query_key_value)
+            if self.transformer.layers[i].is_decoder:
+                print(f'merge layer {i} lora cross attention back to linear')
+                self.transformer.layers[i].cross_attention.dense = merge_linear_lora(self.transformer.layers[i].cross_attention.dense)
+                self.transformer.layers[i].cross_attention.query = merge_linear_lora(self.transformer.layers[i].cross_attention.query)
+                self.transformer.layers[i].cross_attention.key_value = merge_linear_lora(self.transformer.layers[i].cross_attention.key_value)
 
 if __name__ == '__main__':
     class Model(nn.Module):