do not offload depthwise conv2d

Author: masahi

python/tvm/relay/op/contrib/cutlass.py

@@ -90,14 +90,22 @@ def check_batch_matmul(call):
     return check_dtype(lhs, rhs) and not transpose_a and transpose_b
 
 
+def is_depthwise_conv2d(ic, oc, groups):
+    return ic == oc == groups
+
+
 def check_conv2d(call):
     """Check if the given conv2d workload can be offloaded to CUTLASS."""
     conv2d = get_root_call(call, "nn.conv2d")
     data_layout = conv2d.attrs.data_layout
     kernel_layout = conv2d.attrs.kernel_layout
     data = conv2d.args[0].checked_type
     weight = conv2d.args[1].checked_type
-    return data_layout == "NHWC" and kernel_layout == "OHWI" and check_dtype(data, weight)
+    if data_layout != "NHWC" or kernel_layout != "OHWI" or not check_dtype(data, weight):
+        return False
+    IC = data.shape[3]
+    OC = weight.shape[0]
+    return not is_depthwise_conv2d(IC, OC, call.attrs.groups)
 
 
 def partition_for_cutlass(mod):