[ { "matrix_shape": [2,3], "min_val": 0, "max_val": 10 }, { "matrix_shape": [3,3], "min_val": -20, "max_val": 20 }, { "matrix_shape": [2,2], "min_val": -5, "max_val": 10 }, { "matrix_shape": [2,2], "min_val": -10, "max_val": 10 } ]