Class backend_run

tests/test_metal_python_ref_compare.cpp:24–30

};

struct backend_run {
    std::string backend;
    double encode_ms = 0.0;
    double final_ms = 0.0;
    std::vector<metric_row> encoder_rows;
    std::vector<metric_row> final_rows;
};

static std::string shape_to_string(const std::vector<int> & shape) {
    std::string s;