pnnx fuse wav2vec style mha (#6004)

tools/pnnx/src/pass_level5/fuse_multiheadattention.cpp

@@ -1162,6 +1162,35 @@ pnnx.Output             output      1 0 out
     }
 };
 
+class fuse_multiheadattention_pass_12_2 : public fuse_multiheadattention_pass_12
+{
+public:
+    const char* match_pattern_graph() const
+    {
+        return R"PNNXIR(7767517
+18 17
+pnnx.Input              input_0     0 1 input
+nn.Linear               op_0        1 1 input 14 bias=%qbias in_features=%embed_dim out_features=%embed_dim @bias @weight
+nn.Linear               op_1        1 1 input 15 bias=%kbias in_features=%embed_dim out_features=%embed_dim @bias @weight
+nn.Linear               op_2        1 1 input 16 bias=%vbias in_features=%embed_dim out_features=%embed_dim @bias @weight
+Tensor.view             op_3        1 1 14 17 shape=(%batch,%size,%num_heads,%feat_per_head)
+Tensor.view             op_4        1 1 15 18 shape=(%batch,%size,%num_heads,%feat_per_head)
+Tensor.view             op_5        1 1 16 19 shape=(%batch,%size,%num_heads,%feat_per_head)
+torch.transpose         op_6        1 1 19 20 dim0=1 dim1=2
+torch.transpose         op_7        1 1 18 21 dim0=1 dim1=2
+torch.transpose         op_8        1 1 17 22 dim0=1 dim1=2
+Tensor.contiguous       op_9        1 1 20 201 memory_format=*
+Tensor.contiguous       op_10       1 1 21 211 memory_format=*
+Tensor.contiguous       op_11       1 1 22 221 memory_format=*
+F.scaled_dot_product_attention op_12 3 1 221 211 201 23 attn_mask=None dropout_p=0.000000e+00 is_causal=False
+torch.transpose         op_13       1 1 23 24 dim0=1 dim1=2
+Tensor.reshape          op_14       1 1 24 25 shape=(%batch,%size,%embed_dim)
+nn.Linear               out_proj    1 1 25 out bias=%outbias in_features=%embed_dim out_features=%embed_dim @bias @weight
+pnnx.Output             output      1 0 out
+)PNNXIR";
+    }
+};
+
 class fuse_multiheadattention_pass_13 : public fuse_multiheadattention_pass_qkv
 {
 public:
@@ -2145,6 +2174,7 @@ void fuse_multiheadattention(Graph& graph)
     fuse_multiheadattention_pass_10 j;
     fuse_multiheadattention_pass_12 k;
     fuse_multiheadattention_pass_12_1 k1;
+    fuse_multiheadattention_pass_12_2 k2;
     fuse_multiheadattention_pass_13 l;
     fuse_multiheadattention_pass_14 m;
     fuse_multiheadattention_pass_15 n;
@@ -2186,6 +2216,7 @@ void fuse_multiheadattention(Graph& graph)
     pnnx_graph_rewrite(graph, &j, opindex);
     pnnx_graph_rewrite(graph, &k, opindex);
     pnnx_graph_rewrite(graph, &k1, opindex);
+    pnnx_graph_rewrite(graph, &k2, opindex);
     pnnx_graph_rewrite(graph, &l, opindex);
     pnnx_graph_rewrite(graph, &m, opindex);
     pnnx_graph_rewrite(graph, &n, opindex);