feat: add elu_backward base

Author: voltjia

src/base/elu_backward.h

@@ -0,0 +1,65 @@
+#ifndef INFINI_OPS_BASE_ELU_BACKWARD_H_
+#define INFINI_OPS_BASE_ELU_BACKWARD_H_
+
+#include "operator.h"
+
+namespace infini::ops {
+
+class EluBackward : public Operator<EluBackward> {
+ public:
+  EluBackward(const Tensor grad_output, const double alpha, const double scale,
+              const double input_scale, const bool is_result,
+              const Tensor self_or_result, Tensor grad_input)
+      : grad_output_shape_{grad_output.shape()},
+        grad_output_strides_{grad_output.strides()},
+        grad_output_type_{grad_output.dtype()},
+        self_or_result_shape_{self_or_result.shape()},
+        self_or_result_strides_{self_or_result.strides()},
+        self_or_result_type_{self_or_result.dtype()},
+        grad_input_shape_{grad_input.shape()},
+        grad_input_strides_{grad_input.strides()},
+        grad_input_type_{grad_input.dtype()},
+        alpha_{alpha},
+        scale_{scale},
+        input_scale_{input_scale},
+        is_result_{is_result},
+        device_index_{grad_input.device().index()} {}
+
+  virtual void operator()(const Tensor grad_output, const double alpha,
+                          const double scale, const double input_scale,
+                          const bool is_result, const Tensor self_or_result,
+                          Tensor grad_input) const = 0;
+
+ protected:
+  Tensor::Shape grad_output_shape_;
+
+  Tensor::Strides grad_output_strides_;
+
+  DataType grad_output_type_;
+
+  Tensor::Shape self_or_result_shape_;
+
+  Tensor::Strides self_or_result_strides_;
+
+  DataType self_or_result_type_;
+
+  Tensor::Shape grad_input_shape_;
+
+  Tensor::Strides grad_input_strides_;
+
+  DataType grad_input_type_;
+
+  double alpha_{};
+
+  double scale_{};
+
+  double input_scale_{};
+
+  bool is_result_{};
+
+  int device_index_{0};
+};
+
+}  // namespace infini::ops
+
+#endif