Migrate concat layer

include/shape.hpp

@@ -21,6 +21,30 @@ class InvalidShapeException : public std::runtime_error {
                   actual
               )
           ) {}
+
+    InvalidShapeException(
+        const std::string& message,
+        const Shape&       shape_a,
+        const Shape&       shape_b
+    )
+        : std::runtime_error(
+              std::format(
+                  "{}. Shape A: [{}], Shape B: [{}]",
+                  message,
+                  format_shape(shape_a),
+                  format_shape(shape_b)
+              )
+          ) {}
+
+  private:
+    static std::string format_shape(const Shape& shape) {
+        std::string result;
+        for (size_t i = 0; i < shape.size(); ++i) {
+            if (i > 0) result += ", ";
+            result += std::to_string(shape[i]);
+        }
+        return result;
+    }
 };
 
 }  // namespace CUDANet