COMPMID-3539: Ignore align_corners for scaled size of 1

Scale kernels failed to validate when align_corners is true
for scaled output size 1. Change this behavior to ignoring
align_corners value to be aligned with expected behavior of
higher-level frameworks.

Also the minimum output size generated by the fixture for
Scale kernels is changed to 1.

Change-Id: Ib8e479af8bc43de3780005545f0c53fe195dc22e
Signed-off-by: Sang-Hoon Park <sang-hoon.park@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/3478
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/core/utils/ScaleUtils.cpp b/src/core/utils/ScaleUtils.cpp
new file mode 100644
index 0000000000..488b3dfaf5
--- /dev/null
+++ b/src/core/utils/ScaleUtils.cpp
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2020 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "src/core/utils/ScaleUtils.h"
+#include "arm_compute/core/Helpers.h"
+
+float arm_compute::scale_utils::calculate_resize_ratio(size_t input_size, size_t output_size, bool align_corners)
+{
+    const size_t offset = align_corners ? 1 : 0;
+    const auto   in     = input_size - offset;
+    const auto   out    = output_size - offset;
+
+    ARM_COMPUTE_ERROR_ON((input_size == 0 || output_size == 0) && offset == 1);
+    ARM_COMPUTE_ERROR_ON(out == 0);
+
+    return static_cast<float>(in) / static_cast<float>(out);
+}
+
+bool arm_compute::scale_utils::is_align_corners_allowed_output_shape(const TensorShape &output_shape, DataLayout layout)
+{
+    const size_t idx_width  = get_data_layout_dimension_index(layout, DataLayoutDimension::WIDTH);
+    const size_t idx_height = get_data_layout_dimension_index(layout, DataLayoutDimension::HEIGHT);
+    return (output_shape[idx_width] > 1) && (output_shape[idx_height] > 1);
+}
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