import { DType, Tensor } from '../../../library';
import { BackwardOp, VariableI } from '../../types';
export declare class ConcatBack<DTpe extends DType> implements BackwardOp<DTpe> {
    a: VariableI<DTpe>;
    b: VariableI<DTpe>;
    axis: number;
    constructor(a: VariableI<DTpe>, b: VariableI<DTpe>, axis: number);
    backward(grad: Tensor<DTpe>): void;
    delete(): void;
}