[BUG_FIX] Fix resize test

python/tvm/relay/frontend/onnx.py

@@ -937,7 +937,10 @@ def _impl_v9(cls, inputs, attr, params):
         else:
             assert len(scales) == 4
             attr['layout'] = 'NCHW'
-            attr['align_corners'] = True
+            if method == 'nearest_neighbor':
+                attr['align_corners'] = False
+            else:
+                attr['align_corners'] = True
             op_name = 'upsampling'
         return AttrCvt(op_name)(inputs, attr)
 

python/tvm/relay/frontend/pytorch.py

@@ -1536,7 +1536,9 @@ def _impl(inputs, input_types):
         else:
             align_corners = False
 
-        if align_corners:
+        if method == "nearest_neighbor":
+            coord_trans = "asymmetric"
+        elif align_corners:
             coord_trans = "align_corners"
         else:
             coord_trans = "half_pixel"
@@ -1581,7 +1583,9 @@ def _impl(inputs, input_types):
         else:
             align_corners = False
 
-        if align_corners:
+        if method == "nearest_neighbor":
+            coord_trans = "asymmetric"
+        elif align_corners:
             coord_trans = "align_corners"
         else:
             coord_trans = "half_pixel"

python/tvm/topi/image/resize.py

@@ -529,8 +529,11 @@ def resize(data, size, layout="NCHW", method="bilinear",
         or [batch, in_height*scale, in_width*scale, channel]
         or 5-D with shape [batch, channel-major, in_height*scale, in_width*scale, channel-minor]
     """
-
     method = method.lower()
+    if method == "nearest_neighbor" and coordinate_transformation_mode != "asymmetric":
+        raise ValueError('Topi Resize does not support the combination of method %s ' \
+                         'and coordinate_transformation_mode %s' %
+                         (method, coordinate_transformation_mode))
     if layout == 'NHWC':
         in_n, in_h, in_w, in_c = data.shape
         if output_shape is None:

tests/python/relay/dyn/test_dynamic_op_level5.py

@@ -49,7 +49,11 @@ def verify_resize(dshape, scale, method, layout):
             ref_res = tvm.topi.testing.upsampling_python(x_data, (scale, scale), layout)
         x = relay.var("x", relay.TensorType(dshape, "float32"))
         size_var = relay.var("size", relay.TensorType((2,), "int64"))
-        z = relay.image.resize(x, size_var, layout, method, "align_corners")
+
+        coord_trans = "asymmetric" if method == "nearest_neighbor" else "align_corners"
+        z = relay.image.resize(x, size_var, layout, method,
+                              coordinate_transformation_mode=coord_trans)
+
         zz = run_infer_type(z)
         func = relay.Function([x, size_var], z)
 
@@ -60,9 +64,11 @@ def verify_resize(dshape, scale, method, layout):
                 intrp = relay.create_executor(kind, mod=mod, ctx=ctx, target=target)
                 op_res = intrp.evaluate()(x_data, size)
                 tvm.testing.assert_allclose(op_res.asnumpy(), ref_res, rtol=1e-4, atol=1e-6)
+
     for method in ["bilinear", "nearest_neighbor"]:
         for layout in ["NCHW", "NHWC"]:
             verify_resize((1, 4, 4, 4), 2, method, layout)
+            verify_resize((2, 8, 17, 20), 7, method, layout)
 
 if __name__ == "__main__":
     test_resize_infer_type()

tests/python/relay/test_op_level5.py

@@ -41,19 +41,21 @@ def test_resize_infer_type():
     assert zz.checked_type == relay.TensorType((n, c, 100, 200), "int8")
 
 def test_resize():
-    def verify_resize(dshape, scale, method, layout):
+    def verify_resize(dshape, scale, method, layout, coord_trans):
         if layout == "NHWC":
             size = (dshape[1] * scale, dshape[2] * scale)
         else:
             size = (dshape[2] * scale, dshape[3] * scale)
 
         x_data = np.random.uniform(size=dshape).astype("float32")
+
         if method == "bilinear":
-            ref_res = tvm.topi.testing.bilinear_resize_python(x_data, size, layout)
+            ref_res = tvm.topi.testing.bilinear_resize_python(x_data, size, layout, coord_trans)
         else:
             ref_res = tvm.topi.testing.upsampling_python(x_data, (scale, scale), layout)
         x = relay.var("x", relay.TensorType(dshape, "float32"))
-        z = relay.image.resize(x, size, layout, method, "align_corners")
+        z = relay.image.resize(x, size, layout, method,
+                              coordinate_transformation_mode=coord_trans)
         assert "size=" in z.astext()
         zz = run_infer_type(z)
         assert zz.checked_type == relay.TensorType(ref_res.shape, "float32")
@@ -63,10 +65,13 @@ def verify_resize(dshape, scale, method, layout):
             for kind in ["graph", "debug"]:
                 intrp = relay.create_executor(kind, ctx=ctx, target=target)
                 op_res = intrp.evaluate(func)(x_data)
-                tvm.testing.assert_allclose(op_res.asnumpy(), ref_res, rtol=1e-4, atol=1e-6)
-    for method in ["bilinear", "nearest_neighbor"]:
-        for layout in ["NHWC", "NCHW"]:
-            verify_resize((1, 4, 4, 4), 2, method, layout)
+                tvm.testing.assert_allclose(op_res.asnumpy(), ref_res, rtol=1e-4, atol=1e-5)
+
+    for layout in ["NHWC", "NCHW"]:
+        verify_resize((1, 4, 4, 4), 2, "bilinear", layout, "align_corners")
+        verify_resize((2, 8, 17, 20), 3, "bilinear", layout, "half_pixel")
+        verify_resize((2, 8, 17, 20), 3, "bilinear", layout, "asymmetric")
+        verify_resize((3, 4, 5, 6), 5, "nearest_neighbor", layout, "asymmetric")
 
 def test_resize3d_infer_type():
     n, c, d, h, w = te.size_var("n"), te.size_var("c"), te.size_var("d"), te.size_var("h"), te.size_var("w")

tests/python/relay/test_pass_dynamic_to_static.py

@@ -251,7 +251,9 @@ def verify_resize(shape, scale, method, layout):
 
         x = relay.var("x", relay.TensorType(shape, "float32"))
         size_var = relay.const(np.array(size).astype("float32"))
-        z = relay.image.resize(x, size_var, layout, method, "align_corners")
+        coord_trans = "asymmetric" if method == "nearest_neighbor" else "align_corners"
+        z = relay.image.resize(x, size_var, layout, method,
+                              coordinate_transformation_mode=coord_trans)
 
         func = run_infer_type(relay.Function([x], z))
         func2 = run_opt_pass(run_opt_pass(func, transform.DynamicToStatic()),

tests/python/topi/python/test_topi_image.py

@@ -81,6 +81,9 @@ def test_resize():
     # half_pixel
     verify_resize(4, 16, 16, 16, 32, 32, 'NCHW', "half_pixel", method="bilinear")
     verify_resize(4, 16, 16, 16, 32, 32, 'NHWC', "half_pixel", method="bilinear")
+    # Bilinear + Fractional
+    verify_resize(4, 16, 32, 32, 50, 50, 'NCHW', "asymmetric", method="bilinear")
+    verify_resize(4, 16, 32, 32, 50, 50, 'NHWC', "asymmetric", method="bilinear")
 
 
 def verify_resize3d(batch, in_channel, in_depth, in_height, in_width, out_depth, out_height, out_width,