From 42022aa07901acedb4770528dc3fc44657eda85e Mon Sep 17 00:00:00 2001
From: Jiacheng Huang <huangjiacheng0709@outlook.com>
Date: Sat, 9 May 2026 18:20:04 +0800
Subject: [PATCH] feat: add `upsample_bilinear2d_backward` base

---
 src/base/upsample_bilinear2d_backward.h | 55 +++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 src/base/upsample_bilinear2d_backward.h

diff --git a/src/base/upsample_bilinear2d_backward.h b/src/base/upsample_bilinear2d_backward.h
new file mode 100644
index 00000000..6fd38c17
--- /dev/null
+++ b/src/base/upsample_bilinear2d_backward.h
@@ -0,0 +1,55 @@
+#ifndef INFINI_OPS_BASE_UPSAMPLE_BILINEAR2D_BACKWARD_H_
+#define INFINI_OPS_BASE_UPSAMPLE_BILINEAR2D_BACKWARD_H_
+
+#include "operator.h"
+
+namespace infini::ops {
+
+class UpsampleBilinear2dBackward : public Operator<UpsampleBilinear2dBackward> {
+ public:
+  UpsampleBilinear2dBackward(const Tensor grad_output,
+                             const std::vector<int64_t> output_size,
+                             const std::vector<int64_t> input_size,
+                             const bool align_corners, Tensor grad_input)
+      : grad_output_shape_{grad_output.shape()},
+        grad_output_strides_{grad_output.strides()},
+        grad_output_type_{grad_output.dtype()},
+        grad_input_shape_{grad_input.shape()},
+        grad_input_strides_{grad_input.strides()},
+        grad_input_type_{grad_input.dtype()},
+        output_size_{output_size},
+        input_size_{input_size},
+        align_corners_{align_corners},
+        device_index_{grad_input.device().index()} {}
+
+  virtual void operator()(const Tensor grad_output,
+                          const std::vector<int64_t> output_size,
+                          const std::vector<int64_t> input_size,
+                          const bool align_corners,
+                          Tensor grad_input) const = 0;
+
+ protected:
+  Tensor::Shape grad_output_shape_;
+
+  Tensor::Strides grad_output_strides_;
+
+  DataType grad_output_type_;
+
+  Tensor::Shape grad_input_shape_;
+
+  Tensor::Strides grad_input_strides_;
+
+  DataType grad_input_type_;
+
+  std::vector<int64_t> output_size_{};
+
+  std::vector<int64_t> input_size_{};
+
+  bool align_corners_{};
+
+  int device_index_{0};
+};
+
+}  // namespace infini::ops
+
+#endif