feat: add where base

Author: voltjia

src/base/where.h

@@ -0,0 +1,59 @@
+#ifndef INFINI_OPS_BASE_WHERE_H_
+#define INFINI_OPS_BASE_WHERE_H_
+
+#include "operator.h"
+
+namespace infini::ops {
+
+class Where : public Operator<Where> {
+ public:
+  Where(const Tensor condition, const Tensor input, const Tensor other,
+        Tensor out)
+      : condition_shape_{condition.shape()},
+        condition_strides_{condition.strides()},
+        condition_type_{condition.dtype()},
+        input_shape_{input.shape()},
+        input_strides_{input.strides()},
+        input_type_{input.dtype()},
+        other_shape_{other.shape()},
+        other_strides_{other.strides()},
+        other_type_{other.dtype()},
+        out_shape_{out.shape()},
+        out_strides_{out.strides()},
+        out_type_{out.dtype()},
+        device_index_{out.device().index()} {}
+
+  virtual void operator()(const Tensor condition, const Tensor input,
+                          const Tensor other, Tensor out) const = 0;
+
+ protected:
+  Tensor::Shape condition_shape_;
+
+  Tensor::Strides condition_strides_;
+
+  DataType condition_type_;
+
+  Tensor::Shape input_shape_;
+
+  Tensor::Strides input_strides_;
+
+  DataType input_type_;
+
+  Tensor::Shape other_shape_;
+
+  Tensor::Strides other_strides_;
+
+  DataType other_type_;
+
+  Tensor::Shape out_shape_;
+
+  Tensor::Strides out_strides_;
+
+  DataType out_type_;
+
+  int device_index_{0};
+};
+
+}  // namespace infini::ops
+
+#endif