Method shape_valid

imperative/src/impl/interpreter/tensor_info.h:163–166

    size_t cand_index = UINT_MAX;

    bool shape_valid() {
        MGB_LOCK_GUARD(lock);
        return desc.layout.ndim;
    }

    void update_layout(const TensorLayout& layout) {
        MGB_LOCK_GUARD(lock);