[AlterLayout] NCHW upsampling

src/relay/op/nn/upsampling.cc

@@ -18,6 +18,31 @@ namespace relay {
 
 TVM_REGISTER_NODE_TYPE(UpSamplingAttrs);
 
+template <typename T>
+Array<Array<Layout> > UpsamplingInferCorrectLayout(
+    const Attrs& attrs,
+    const Array<Layout>& new_in_layouts,
+    const Array<Layout>& old_in_layouts,
+    const Array<Array<IndexExpr>> &old_in_shapes) {
+  // NOTE: Discard "const" qualifier here.
+  T *params = const_cast<T*>(attrs.as<T>());
+
+  if (new_in_layouts.defined()) {
+    CHECK_EQ(new_in_layouts.size(), 1);
+
+    Layout raw_layout(params->layout);
+    Layout input = new_in_layouts[0];
+    if (input.IndexOf(LayoutAxis::Get('W')) == raw_layout.IndexOf(LayoutAxis::Get('W')) &&
+      input.IndexOf(LayoutAxis::Get('H')) == raw_layout.IndexOf(LayoutAxis::Get('H')) &&
+        !input.Contains(LayoutAxis::Get('w')) && !input.Contains(LayoutAxis::Get('h'))) {
+      params->layout = input.name();  // modify self to follow the input layout
+    }
+  }
+
+  Layout inferred_layout(params->layout);
+  return Array<Array<Layout> >{{inferred_layout}, {inferred_layout}};
+}
+
 bool UpSamplingRel(const Array<Type>& types,
                    int num_inputs,
                    const Attrs& attrs,
@@ -91,6 +116,8 @@ RELAY_REGISTER_OP("nn.upsampling")
 .add_argument("data", "Tensor", "The input tensor.")
 .set_support_level(2)
 .add_type_rel("UpSampling", UpSamplingRel)
+.set_attr<FInferCorrectLayout>("FInferCorrectLayout",
+  UpsamplingInferCorrectLayout<UpSamplingAttrs>)
 .set_attr<TOpPattern>("TOpPattern", kInjective)
 .set_attr<FTVMCompute>(
   "FTVMCompute", [](const Attrs& attrs,
@@ -101,14 +128,16 @@ RELAY_REGISTER_OP("nn.upsampling")
     CHECK(uattrs != nullptr);
     auto out_tt = out_type.as<TensorTypeNode>();
     CHECK(out_tt) << "expected a tensor type: " << out_type;
-    CHECK(uattrs->layout == "NCHW" || uattrs->layout == "NHWC")
+    const auto layout = uattrs->layout;
+    const auto base_layout = layout.substr(0, 4);
+    CHECK(base_layout == "NCHW" || layout == "NHWC")
       << "unknown layout: " << uattrs->layout;
 
     Array<HalideIR::Expr> oshape;
-    if (uattrs->layout == "NCHW") {
+    if (base_layout == "NCHW") {
       oshape.push_back(out_tt->shape[2]);
       oshape.push_back(out_tt->shape[3]);
-    } else if (uattrs->layout == "NHWC") {
+    } else if (layout == "NHWC") {
       oshape.push_back(out_tt->shape[1]);
       oshape.push_back(out_tt->shape[2]);
     }

topi/include/topi/image/resize.h

@@ -134,6 +134,45 @@ inline Tensor resize_nearest_neighbor_nchw(const Tensor& input,
     }, name, tag);
 }
 
+/*!
+* \brief Resize given tensor to given shape using nearest neighbour for NCHWc
+*
+* \param input The input tensor.
+* \param shape Output shape to resize to.
+* \param align_corners To preserve centers of 4 corner pixels
+* \param name Name of the operation
+* \param tag The tag to mark the operation
+*
+* \return A Tensor resized to given shape
+*/
+inline Tensor resize_nearest_neighbor_nchwc(const Tensor& input,
+                                            const Array<Expr>& shape,
+                                            bool align_corners = false,
+                                            std::string name = "tensor",
+                                            std::string tag = kInjective) {
+  Array<Expr> out_shape;
+  out_shape.push_back(input->shape[0]);
+  out_shape.push_back(input->shape[1]);
+  out_shape.push_back(shape[0]);
+  out_shape.push_back(shape[1]);
+  out_shape.push_back(input->shape[4]);
+
+  Expr h_ratio = shape[0] / input->shape[2];
+  Expr w_ratio = shape[1] / input->shape[3];
+
+  return compute(
+    out_shape, [&](const Array<Var>& indices) {
+    Array<Expr> idx;
+    idx.push_back(indices[0]);
+    idx.push_back(indices[1]);
+    idx.push_back(indices[2] / h_ratio);
+    idx.push_back(indices[3] / w_ratio);
+    idx.push_back(indices[4]);
+
+     return input(idx);
+    }, name, tag);
+}
+
 /*!
 * \brief Resize given tensor to given shape using nearest neighbour
 *
@@ -153,11 +192,17 @@ inline Tensor resize_nearest_neighbor(const Tensor& input,
                                       std::string name = "tensor",
                                       std::string tag = kInjective) {
   CHECK_EQ(align_corners, false) << "Align corners not supported for nearest neighbour";
-
+  auto base_layout = layout.substr(0, 4);
   if (layout == "NHWC") {
     return resize_nearest_neighbor_nhwc(input, shape, align_corners);
-  } else {
+  } else if (layout == "NCHW") {
     return resize_nearest_neighbor_nchw(input, shape, align_corners);
+  } else if (base_layout == "NCHW") {
+    // NCHWc
+    return resize_nearest_neighbor_nchwc(input, shape, align_corners);
+  } else {
+    LOG(FATAL) << "Unknown layout: " << layout;
+    return Tensor();
   }
 }
 

topi/python/topi/nn/upsampling.py

@@ -30,8 +30,8 @@ def upsampling(data, scale, layout="NCHW", method='NEAREST_NEIGHBOR'):
         4-D with shape [batch, channel, in_height*scale, in_width*scale]
         or [batch, in_height*scale, in_width*scale, channel]
     """
-
-    if layout == "NCHW":
+    base_layout = layout[0:4]
+    if base_layout == "NCHW":
         out_shape = (simplify(data.shape[2] * scale), simplify(data.shape[3] * scale))
     elif layout == "NHWC":
         out_shape = (simplify(data.shape[1] * scale), simplify(data.shape[2] * scale))