@hoff97/tensor-js/dist/lib/autograd/ops/util/transposeBack.js

PyTorch like deep learning inferrence library

export class TransposeBack {
    constructor(a, permutation) {
        this.a = a;
        this.permutation = permutation;
    }
    backward(grad) {
        const inversePerm = new Array(this.permutation.length);
        for (let i = 0; i < this.permutation.length; i++) {
            inversePerm[this.permutation[i]] = i;
        }
        const gradA = grad.transpose(inversePerm);
        const needed = this.a.backward(gradA);
        if (!needed) {
            gradA.delete();
        }
    }
    delete() {
        if (!this.a.isLeaf()) {
            this.a.delete();
        }
    }
}
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