Fix Bug in Bilinear Interpolation and Add Deform Conv to PT FrontEnd

include/tvm/topi/detail/tensor_utils.h

@@ -26,6 +26,7 @@
 
 #include <tvm/te/operation.h>
 
+#include <vector>
 namespace tvm {
 namespace topi {
 namespace detail {
@@ -64,29 +65,36 @@ inline bool is_empty_shape(const Array<PrimExpr>& x) {
  */
 inline PrimExpr bilinear_sample_nchw(const Tensor& input, const Array<PrimExpr>& indices,
                                      const PrimExpr max_y, const PrimExpr max_x) {
+  auto batch_id = indices[0];
+  auto channel_id = indices[1];
   auto in_y = indices[2];
-  auto yf = tvm::floor(in_y);
-  auto yc = tvm::cast(DataType::Int(32), tvm::ceil(in_y));
-
-  auto y0 = tvm::cast(DataType::Int(32), tvm::floor(in_y));
-  auto y1 = tvm::if_then_else((yc > max_y), max_y, yc);
-  auto y_lerp = in_y - yf;
-
   auto in_x = indices[3];
-  auto xf = tvm::floor(in_x);
-  auto xc = tvm::cast(DataType::Int(32), tvm::ceil(in_x));
-
-  auto x0 = tvm::cast(DataType::Int(32), tvm::floor(in_x));
-  auto x1 = tvm::if_then_else((xc > max_x), max_x, xc);
-  auto x_lerp = in_x - xf;
 
-  auto A = input(indices[0], indices[1], y0, x0);
-  auto B = input(indices[0], indices[1], y0, x1);
-  auto C = input(indices[0], indices[1], y1, x0);
-  auto D = input(indices[0], indices[1], y1, x1);
-
-  return A * (1 - x_lerp) * (1 - y_lerp) + B * x_lerp * (1 - y_lerp) + C * (1 - x_lerp) * y_lerp +
-         D * x_lerp * y_lerp;
+  auto y_low = tvm::cast(DataType::Int(32), tvm::floor(in_y));
+  auto y_high = y_low + 1;
+
+  auto x_low = tvm::cast(DataType::Int(32), tvm::floor(in_x));
+  auto x_high = x_low + 1;
+
+  auto wy_h = in_y - y_low;
+  auto wx_h = in_x - x_low;
+  auto wy_l = 1 - wy_h;
+  auto wx_l = 1 - wx_h;
+
+  PrimExpr val = 0;
+  std::vector<std::vector<PrimExpr>> wx_xp{{wx_l, x_low}, {wx_h, x_high}};
+  std::vector<std::vector<PrimExpr>> wy_yp{{wy_l, y_low}, {wy_h, y_high}};
+  for (auto wx_xp_ele : wx_xp) {
+    for (auto wy_yp_ele : wy_yp) {
+      auto wx = wx_xp_ele[0];
+      auto xp = wx_xp_ele[1];
+      auto wy = wy_yp_ele[0];
+      auto yp = wy_yp_ele[1];
+      val += tvm::if_then_else(0 <= yp && yp <= max_y && 0 <= xp && xp <= max_x,
+                               wx * wy * input(batch_id, channel_id, yp, xp), 0);
+    }
+  }
+  return val;
 }
 
 /*!
@@ -101,29 +109,36 @@ inline PrimExpr bilinear_sample_nchw(const Tensor& input, const Array<PrimExpr>&
  */
 inline PrimExpr bilinear_sample_nhwc(const Tensor& input, const Array<PrimExpr>& indices,
                                      const PrimExpr max_y, const PrimExpr max_x) {
+  auto batch_id = indices[0];
+  auto channel_id = indices[3];
   auto in_y = indices[1];
-  auto yf = tvm::floor(in_y);
-  auto yc = tvm::cast(DataType::Int(32), tvm::ceil(in_y));
-
-  auto y0 = tvm::cast(DataType::Int(32), tvm::floor(in_y));
-  auto y1 = tvm::if_then_else((yc > max_y), max_y, yc);
-  auto y_lerp = in_y - yf;
-
   auto in_x = indices[2];
-  auto xf = tvm::floor(in_x);
-  auto xc = tvm::cast(DataType::Int(32), tvm::ceil(in_x));
-
-  auto x0 = tvm::cast(DataType::Int(32), tvm::floor(in_x));
-  auto x1 = tvm::if_then_else((xc > max_x), max_x, xc);
-  auto x_lerp = in_x - xf;
 
-  auto A = input(indices[0], y0, x0, indices[3]);
-  auto B = input(indices[0], y0, x1, indices[3]);
-  auto C = input(indices[0], y1, x0, indices[3]);
-  auto D = input(indices[0], y1, x1, indices[3]);
-
-  return A * (1 - x_lerp) * (1 - y_lerp) + B * x_lerp * (1 - y_lerp) + C * (1 - x_lerp) * y_lerp +
-         D * x_lerp * y_lerp;
+  auto y_low = tvm::cast(DataType::Int(32), tvm::floor(in_y));
+  auto y_high = y_low + 1;
+
+  auto x_low = tvm::cast(DataType::Int(32), tvm::floor(in_x));
+  auto x_high = x_low + 1;
+
+  auto wy_h = in_y - y_low;
+  auto wx_h = in_x - x_low;
+  auto wy_l = 1 - wy_h;
+  auto wx_l = 1 - wx_h;
+
+  PrimExpr val = 0;
+  std::vector<std::vector<PrimExpr>> wx_xp{{wx_l, x_low}, {wx_h, x_high}};
+  std::vector<std::vector<PrimExpr>> wy_yp{{wy_l, y_low}, {wy_h, y_high}};
+  for (auto wx_xp_ele : wx_xp) {
+    for (auto wy_yp_ele : wy_yp) {
+      auto wx = wx_xp_ele[0];
+      auto xp = wx_xp_ele[1];
+      auto wy = wy_yp_ele[0];
+      auto yp = wy_yp_ele[1];
+      val += tvm::if_then_else(0 <= yp && yp <= max_y && 0 <= xp && xp <= max_x,
+                               wx * wy * input(batch_id, yp, xp, channel_id), 0);
+    }
+  }
+  return val;
 }
 
 }  // namespace detail

python/tvm/relay/frontend/pytorch.py

@@ -1928,6 +1928,32 @@ def roi_align(self, inputs, input_types):
 
         return _op.vision.roi_align(data, boxes, output_size, spatial_scale, sample_ratio)
 
+    def deform_conv2d(self, inputs, input_types):
+        data = inputs[0]
+        weight = inputs[1]
+        offset = inputs[2]
+        strides = (inputs[4], inputs[5])
+        padding = (inputs[6], inputs[7])
+        dilation = (inputs[8], inputs[9])
+        groups = inputs[10]
+        deformable_groups = inputs[11]
+        weight_shape = self.infer_shape(weight)
+        output_channels = weight_shape[0]
+        kernel_size = (weight_shape[2], weight_shape[3])
+
+        return _op.nn.deformable_conv2d(
+            data,
+            offset,
+            weight,
+            strides,
+            padding,
+            dilation,
+            deformable_groups,
+            groups,
+            output_channels,
+            kernel_size,
+        )
+
     def unbind(self, inputs, input_types):
         data = inputs[0]
         dim = int(inputs[1])
@@ -2292,6 +2318,7 @@ def create_convert_map(self):
             "torchvision::nms": self.nms,
             "aten::logsumexp": self.logsumexp,
             "torchvision::roi_align": self.roi_align,
+            "torchvision::deform_conv2d": self.deform_conv2d,
             "aten::unbind": self.unbind,
             "aten::__and__": self.logical_and,
             "aten::logical_and": self.logical_and,

python/tvm/topi/testing/deformable_conv2d_python.py

@@ -17,6 +17,7 @@
 # pylint: disable=invalid-name, too-many-locals, too-many-arguments
 """Deformable convolution in python"""
 import itertools
+import math
 import numpy as np
 from tvm.topi.nn.utils import get_pad_tuple
 
@@ -80,15 +81,22 @@ def deformable_conv2d_nchw_python(
         dilation_h, dilation_w = dilation
 
     def _bilinear(n, c, h, w):
-        low_h, low_w = int(h), int(w)
-        high_h = min(low_h + 1, in_height - 1)
-        high_w = min(low_w + 1, in_width - 1)
-        y_lerp = h - low_h
-        x_lerp = w - low_w
-
-        bottom = (1 - x_lerp) * a_np[n, c, low_h, low_w] + x_lerp * a_np[n, c, low_h, high_w]
-        top = (1 - x_lerp) * a_np[n, c, high_h, low_w] + x_lerp * a_np[n, c, high_h, high_w]
-        return (1 - y_lerp) * bottom + y_lerp * top
+        y_low = int(math.floor(h))
+        x_low = int(math.floor(w))
+        y_high = y_low + 1
+        x_high = x_low + 1
+
+        wy_h = h - y_low
+        wx_h = w - x_low
+        wy_l = 1 - wy_h
+        wx_l = 1 - wx_h
+
+        val = 0
+        for wx, xp in zip((wx_l, wx_h), (x_low, x_high)):
+            for wy, yp in zip((wy_l, wy_h), (y_low, y_high)):
+                if 0 <= yp < in_height and 0 <= xp < in_width:
+                    val += wx * wy * a_np[n, c, yp, xp]
+        return val
 
     a_deform = np.zeros((batch, in_channel, out_height, out_width, kernel_h, kernel_w), dtype=dtype)
     for n, h, w in itertools.product(range(batch), range(out_height), range(out_width)):

python/tvm/topi/testing/roi_align_python.py

@@ -31,25 +31,29 @@ def roi_align_nchw_python(a_np, rois_np, pooled_size, spatial_scale, sample_rati
     else:
         pooled_size_h, pooled_size_w = pooled_size
 
-    def _bilinear(b, c, y, x):
+    def _bilinear(n, c, y, x):
         if y < -1 or y > height or x < -1 or x > width:
             return 0
-        y = max(y, 0.0)
-        x = max(x, 0.0)
-        y_low = int(y)
-        x_low = int(x)
 
-        y_high = min(y_low + 1, height - 1)
-        x_high = min(x_low + 1, width - 1)
+        y = min(max(y, 0), height - 1)
+        x = min(max(x, 0), width - 1)
 
-        ly = y - y_low
-        lx = x - x_low
-        return (
-            (1 - ly) * (1 - lx) * a_np[b, c, y_low, x_low]
-            + (1 - ly) * lx * a_np[b, c, y_low, x_high]
-            + ly * (1 - lx) * a_np[b, c, y_high, x_low]
-            + ly * lx * a_np[b, c, y_high, x_high]
-        )
+        y_low = int(math.floor(y))
+        x_low = int(math.floor(x))
+        y_high = y_low + 1
+        x_high = x_low + 1
+
+        wy_h = y - y_low
+        wx_h = x - x_low
+        wy_l = 1 - wy_h
+        wx_l = 1 - wx_h
+
+        val = 0
+        for wx, xp in zip((wx_l, wx_h), (x_low, x_high)):
+            for wy, yp in zip((wy_l, wy_h), (y_low, y_high)):
+                if 0 <= yp < height and 0 <= xp < width:
+                    val += wx * wy * a_np[n, c, yp, xp]
+        return val
 
     for i in range(num_roi):
         roi = rois_np[i]

python/tvm/topi/vision/rcnn/roi_align.py

@@ -60,8 +60,8 @@ def roi_align_nchw(data, rois, pooled_size, spatial_scale, sample_ratio=-1):
 
     def _bilinear(i, c, y, x):
         outside = tvm.tir.any(y < -1.0, x < -1.0, y > height, x > width)
-        y = tvm.te.max(y, 0.0)
-        x = tvm.te.max(x, 0.0)
+        y = tvm.te.min(tvm.te.max(y, 0.0), height - 1)
+        x = tvm.te.min(tvm.te.max(x, 0.0), width - 1)
         val = bilinear_sample_nchw(data, (i, c, y, x), height - 1, width - 1)
         return tvm.tir.if_then_else(outside, 0.0, val)
 

tests/python/frontend/pytorch/test_forward.py

@@ -216,7 +216,6 @@ def verify_model(model_name, input_data=[], custom_convert_map={}, rtol=1e-5, at
 
                 assert_shapes_match(baseline_output, compiled_output)
                 tvm.testing.assert_allclose(baseline_output, compiled_output, rtol=rtol, atol=atol)
-
     del model_name
     del baseline_model
     torch.cuda.empty_cache()
@@ -924,6 +923,85 @@ def test_forward_conv_transpose():
     verify_model(torch.nn.ConvTranspose1d(3, 12, 3, bias=False), input_data=conv1d_input_data)
 
 
+def test_forward_deform_conv():
+    torch.set_grad_enabled(False)
+
+    def test_run(
+        batch_size,
+        in_channels,
+        out_channels,
+        in_height,
+        in_width,
+        out_height,
+        out_width,
+        offset_groups,
+        kh,
+        kw,
+        groups,
+    ):
+        input_shape = [batch_size, in_channels, in_height, in_width]
+        offset_shape = [batch_size, 2 * offset_groups * kh * kw, out_height, out_width]
+        weight_shape = [out_channels, in_channels // groups, kh, kw]
+        input_data = torch.rand(input_shape)
+        offset_data = torch.rand(offset_shape)
+        weight_data = torch.rand(weight_shape)
+
+        class DeformConv2D(Module):
+            def forward(self, *args):
+                return torchvision.ops.deform_conv2d(args[0], args[1], args[2])
+
+        verify_model(
+            DeformConv2D().float().eval(),
+            input_data=[input_data, offset_data, weight_data],
+            rtol=1e-4,
+            atol=1e-4,
+        )
+
+    batch_size = 4
+    in_channels, out_channels = 4, 6
+    in_height, in_width = 10, 10
+    out_height, out_width = 8, 8
+    offset_groups = 2
+    kh, kw = 3, 3
+    groups = 1
+
+    test_run(
+        batch_size,
+        in_channels,
+        out_channels,
+        in_height,
+        in_width,
+        out_height,
+        out_width,
+        offset_groups,
+        kh,
+        kw,
+        groups,
+    )
+
+    batch_size = 5
+    in_channels, out_channels = 4, 6
+    in_height, in_width = 10, 10
+    out_height, out_width = 8, 8
+    offset_groups = 1
+    kh, kw = 3, 3
+    groups = 1
+
+    test_run(
+        batch_size,
+        in_channels,
+        out_channels,
+        in_height,
+        in_width,
+        out_height,
+        out_width,
+        offset_groups,
+        kh,
+        kw,
+        groups,
+    )
+
+
 @tvm.testing.uses_gpu
 def test_forward_threshold():
     torch.set_grad_enabled(False)
@@ -1700,7 +1778,7 @@ def test_forward_roi_align():
     """ROI align"""
     torch.set_grad_enabled(False)
 
-    class ROIAlgin(Module):
+    class ROIAlign(Module):
         def __init__(self, output_sizes, spatial_scale=1.0, sampling_ratio=-1):
             super().__init__()
             self.spatial_scale = spatial_scale
@@ -1721,9 +1799,9 @@ def forward(self, *args):
     in_batch = torch.zeros((35, 1), dtype=torch.float)
     in_boxes = torch.cat([in_batch, in_boxes], dim=1)
 
-    verify_model(ROIAlgin(7), [in_data, in_boxes])
-    verify_model(ROIAlgin((10, 10), 0.7, 5), [in_data, in_boxes])
-    verify_model(ROIAlgin(15, 0.9, 3), [in_data, in_boxes])
+    verify_model(ROIAlign(7), [in_data, in_boxes])
+    verify_model(ROIAlign((10, 10), 0.7, 5), [in_data, in_boxes])
+    verify_model(ROIAlign(15, 0.9, 3), [in_data, in_boxes])
 
 
 @tvm.testing.uses_gpu