feat: add outer base (#377)

Author: voltjia

src/base/outer.h

@@ -0,0 +1,49 @@
+#ifndef INFINI_OPS_BASE_OUTER_H_
+#define INFINI_OPS_BASE_OUTER_H_
+
+#include "operator.h"
+
+namespace infini::ops {
+
+class Outer : public Operator<Outer> {
+ public:
+  Outer(const Tensor input, const Tensor vec2, Tensor out)
+      : input_shape_{input.shape()},
+        input_strides_{input.strides()},
+        input_type_{input.dtype()},
+        vec2_shape_{vec2.shape()},
+        vec2_strides_{vec2.strides()},
+        vec2_type_{vec2.dtype()},
+        out_shape_{out.shape()},
+        out_strides_{out.strides()},
+        out_type_{out.dtype()},
+        device_index_{out.device().index()} {}
+
+  virtual void operator()(const Tensor input, const Tensor vec2,
+                          Tensor out) const = 0;
+
+ protected:
+  Tensor::Shape input_shape_;
+
+  Tensor::Strides input_strides_;
+
+  DataType input_type_;
+
+  Tensor::Shape vec2_shape_;
+
+  Tensor::Strides vec2_strides_;
+
+  DataType vec2_type_;
+
+  Tensor::Shape out_shape_;
+
+  Tensor::Strides out_strides_;
+
+  DataType out_type_;
+
+  int device_index_{0};
+};
+
+}  // namespace infini::ops
+
+#endif