Support qnn.conv2d in FoldExplicitPading (#10982)

* wip support pad + qnn.conv2d folding

* works

* Added test but structural equality is failing

* fixed structural equality test using map_free_vars=True

src/relay/transforms/fold_explicit_padding.cc

@@ -49,8 +49,18 @@ class SimplifyConvPad {
     conv1d_ = IsOp("nn.conv1d");
     conv2d_ = IsOp("nn.conv2d");
     conv3d_ = IsOp("nn.conv3d");
+
     conv_ = (conv1d_ || conv2d_ || conv3d_)({pad_, w_});
-    pattern_ = conv_;
+
+    input_zero_point_ = IsWildcard();
+    kernel_zero_point_ = IsWildcard();
+    input_scale_ = IsWildcard();
+    kernel_scale_ = IsWildcard();
+
+    qconv2d_ = IsOp("qnn.conv2d")(
+        {pad_, w_, input_zero_point_, kernel_zero_point_, input_scale_, kernel_scale_});
+
+    pattern_ = conv_ || qconv2d_;
   }
 
   template <typename T>
@@ -121,9 +131,21 @@ class SimplifyConvPad {
     ICHECK(param);
     Array<Expr> args = pad_node->args;
 
+    auto x = node_map[x_][0];
+    auto w = node_map[w_][0];
+
     // Possibly perform more optimizations if the pad_value is 0
     const ConstantNode* pad_value = args[1].as<ConstantNode>();
-    if (param->pad_mode == "constant" && pad_value && ToScalar(pad_value->data) == 0.0) {
+    if (node_map.find(qconv2d_) != node_map.end()) {
+      Attrs attrs = GetAttrs(param, call_node->attrs.as<Conv2DAttrs>());
+      auto input_zero_point = node_map[input_zero_point_][0];
+      auto kernel_zero_point = node_map[kernel_zero_point_][0];
+      auto input_scale = node_map[input_scale_][0];
+      auto kernel_scale = node_map[kernel_scale_][0];
+      return Call(call_node->op,
+                  {x, w, input_zero_point, kernel_zero_point, input_scale, kernel_scale}, attrs,
+                  call_node->type_args, call_node->span);
+    } else if (param->pad_mode == "constant" && pad_value && ToScalar(pad_value->data) == 0.0) {
       Attrs attrs;
       if (node_map.count(conv1d_)) {
         attrs = GetAttrs(param, call_node->attrs.as<Conv1DAttrs>());
@@ -137,8 +159,6 @@ class SimplifyConvPad {
       if (!attrs.defined()) {
         return post;
       }
-      auto x = node_map[x_][0];
-      auto w = node_map[w_][0];
       return Call(call_node->op, {x, w}, attrs, call_node->type_args, call_node->span);
     }
     return post;
@@ -158,6 +178,11 @@ class SimplifyConvPad {
   DFPattern conv1d_;
   DFPattern conv2d_;
   DFPattern conv3d_;
+  DFPattern qconv2d_;
+  DFPattern input_zero_point_;
+  DFPattern kernel_zero_point_;
+  DFPattern input_scale_;
+  DFPattern kernel_scale_;
 };
 
 class SimplifyExplicitPadding {

tests/python/relay/test_pass_fold_explicit_padding.py

@@ -100,5 +100,50 @@ def validate(ndim, pad_width, pad_value, pad_mode, orig_padding, layout):
     validate(ndim, [[0, 0]] * 2 + [i_pad] * ndim, 0, "edge", orig_pad * ndim, "NCHW")
 
 
+def fold_pad_qconv2d():
+    def before():
+        x = relay.var("x", shape=(1, 56, 56, 64), dtype="int8")
+        weight = relay.var("weight", shape=(3, 3, 64, 64), dtype="int8")
+        input_zero_point = 10
+        pad = relay.nn.pad(x, [[0, 0], [1, 1], [1, 1], [0, 0]], pad_value=input_zero_point)
+        return relay.qnn.op.conv2d(
+            pad,
+            weight,
+            relay.const(input_zero_point, "int32"),
+            relay.const(1, "int32"),
+            relay.const(1, "float32"),
+            relay.const(1, "float32"),
+            channels=64,
+            kernel_size=(3, 3),
+            padding=(0, 0),
+            data_layout="NHWC",
+            kernel_layout="HWIO",
+        )
+
+    def expected():
+        x = relay.var("x", shape=(1, 56, 56, 64), dtype="int8")
+        weight = relay.var("weight", shape=(3, 3, 64, 64), dtype="int8")
+        input_zero_point = 10
+        return relay.qnn.op.conv2d(
+            x,
+            weight,
+            relay.const(input_zero_point, "int32"),
+            relay.const(1, "int32"),
+            relay.const(1, "float32"),
+            relay.const(1, "float32"),
+            channels=64,
+            kernel_size=(3, 3),
+            padding=(1, 1),
+            data_layout="NHWC",
+            kernel_layout="HWIO",
+        )
+
+    a = run_opt_pass(before(), relay.transform.FoldExplicitPadding())
+    b = run_opt_pass(expected(), transform.InferType())
+
+    assert tvm.ir.structural_equal(a, b, map_free_vars=True), "Actual = \n" + str(a)
+
+
 if __name__ == "__main__":
     test_simplify_conv_pad()
+    fold_pad_qconv2d()