[Relay][Topi] Disable conv NHWC pack int8. (#4038)

tests/python/relay/test_backend_compile_engine.py

@@ -93,9 +93,25 @@ def test_compile_full():
     relay.build(mod, 'llvm')
 
 
+def test_compile_nhwc_pack():
+    data = relay.var("data", shape=(1, 1, 1, 1024), dtype="uint8")
+    weight = relay.var("weight", shape=(1, 1, 1024, 1001), dtype="int8")
+    p2 = relay.var("p2", shape=(1, 1, 1, 1), dtype="int32")
+    conv = relay.nn.conv2d(data, weight, kernel_size=(1, 1), data_layout="NHWC",
+                           kernel_layout="HWIO", out_dtype="int32")
+    multiply = relay.multiply(relay.const(-22, dtype='int32'), p2)
+    tile = relay.tile(multiply, reps=(1, 1, 1, 1001))
+    subtract = relay.subtract(conv, tile)
+
+    func = subtract
+    mod = relay.Function(relay.analysis.free_vars(func), func)
+    relay.build(mod, target="llvm")
+
+
 if __name__ == "__main__":
     test_compile_engine()
     test_compile_placeholder_bypass()
     test_compile_injective_with_tuple()
     test_compile_tuple_dup()
     test_compile_full()
+    test_compile_nhwc_pack()

topi/python/topi/x86/conv2d.py

@@ -110,12 +110,15 @@ def _declaration_conv(cfg, data, kernel, strides, padding, dilation, layout, out
     kh, kw, _, _ = get_const_tuple(kernel.shape)
     if layout == 'HWCN':
         return nn.conv2d_hwcn(data, kernel, strides, padding, dilation, out_dtype)
-    elif layout == 'NHWC' and kh == 1 and kw == 1 and kernel.dtype == "int8":
-        if cfg.is_fallback:
-            _get_default_config(cfg, data, kernel, strides, padding, out_dtype, False, layout)
-        # specialize for INT8 1X1 conv on X86
-        return conv2d_avx_1x1._declaration_conv_nhwc_pack(cfg, data, kernel, strides,
-                                                          padding, dilation, out_dtype)
+    # FIXME - https://github.com/dmlc/tvm/issues/4122
+    # _declaration_conv_nhwc_pack expects kernel layout to be HWOI. However, the tests use HWIO
+    # layout. Commenting until we have clarity about the nhwc_pack implementation from the author.
+    # elif layout == 'NHWC' and kh == 1 and kw == 1 and kernel.dtype == "int8":
+    #     if cfg.is_fallback:
+    #         _get_default_config(cfg, data, kernel, strides, padding, out_dtype, False, layout)
+    #     # specialize for INT8 1X1 conv on X86
+    #     return conv2d_avx_1x1._declaration_conv_nhwc_pack(cfg, data, kernel, strides,
+    #                                                       padding, dilation, out_dtype)
     elif layout == 'NHWC':
         return nn.conv2d_nhwc(data, kernel, strides, padding, dilation, out_dtype)
     raise ValueError("not support this layout {} yet".format(layout))