[Bugfix] Bilinear resize bug fix from PR #2777 (#2857)

* error fixed

* rename

* solve conlicts with master

* more test added

* fix error

* remove test

* comment addressed

python/tvm/relay/frontend/mxnet.py

@@ -468,17 +468,18 @@ def _mx_roi_align(inputs, attrs):
     new_attrs["layout"] = "NCHW"
     return _op.vision.roi_align(inputs[0], inputs[1], **new_attrs)
 
-def _mx_upsampling(inputs, attrs):
+def _mx_resize(inputs, attrs):
     scale_height = attrs.get_float("scale_height", None)
     scale_width = attrs.get_float("scale_width", None)
     height = attrs.get_int("height", 1)
     width = attrs.get_int("width", 1)
+    shape = ir_pass.infer_type(inputs[0]).checked_type.shape
     if scale_height is not None:
-        height = scale_height * inputs[0].shape[2]
+        height = (scale_height * shape[2]).astype("int32")
     if scale_width is not None:
-        width = scale_width * inputs[0].shape[3]
-    size = (inputs[0].shape[0], inputs[0].shape[1], height, width)
-    return _op.image.resize(inputs[0], size)
+        width = (scale_width * shape[3]).astype("int32")
+    size = (height, width)
+    return _op.image.resize(inputs[0], size, align_corners=True)
 
 def _mx_roi_pooling(inputs, attrs):
     new_attrs = {}
@@ -770,7 +771,7 @@ _convert_map = {
     "SoftmaxActivation" : _mx_softmax_activation,
     "smooth_l1"     : _mx_smooth_l1,
     # vision
-    "_contrib_BilinearResize2D" : _mx_upsampling,
+    "_contrib_BilinearResize2D" : _mx_resize,
     "_contrib_MultiBoxPrior" : _mx_multibox_prior,
     "_contrib_MultiBoxDetection" : _mx_multibox_detection,
     "_contrib_ROIAlign" : _mx_roi_align,

tests/python/frontend/mxnet/test_forward.py

@@ -505,6 +505,12 @@ def test_forward_gather_nd():
     verify((2, 2), (2, 3), [[1, 1, 0], [0, 1, 0]])
     verify((2, 2, 2), (2, 2), [[0, 1], [1, 0]])
 
+def test_forward_bilinear_resize():
+    # add tests including scale_height and scale_width when mxnet is updated to version 1.5
+    data = mx.sym.var('data')
+    mx_sym = mx.sym.contrib.BilinearResize2D(data, height=5, width=10)
+    verify_mxnet_frontend_impl(mx_sym, (1, 2, 3, 4), (1, 2, 5, 10))
+
 
 if __name__ == '__main__':
     test_forward_mlp()
@@ -543,3 +549,4 @@ if __name__ == '__main__':
     test_forward_smooth_l1()
     test_forward_take()
     test_forward_gather_nd()
+    test_forward_bilinear_resize()