This cutoff is defined for $^6\mathrm{Li}$ as the maximum total HO quanta allowed in the Slater determinants forming the basis space less 2 quanta. The dimension of the resulting many-body Hamiltonian matrix is about 2.8 billion at this cutoff. We return to discussing the many-body HO basis shortly. However, for the training stage of ANN, data up through $N_{\rm max} = 10$ was used, where the Hamiltonian matrix dimension for $^6\mathrm{Li}$ is only about 9.7 million. Comparisons of the results from *feed-forward* ANNs with established methods of estimating the results in the infinite matrix limit are also provided. The paper is organized as follows: In Section \[sec:TheoreticalFramework\], short introductions to the ab initio NCSM method and ANN’s formalism are given. In Section \[sec:ANNDesign\], our ANN’s architecture is presented. Section \[sec:Results\] presents the results and discussions of this work. Section \[sec:Conclusion\] contains our conclusion and future work.

Theoretical Framework {#sec:TheoreticalFramework}
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The NCSM is an ab initio approach to the nuclear many-body problem for light nuclei, which solves for the properties of nuclei for an arbitrary NN interaction, preserving all the symmetries. Naturally, the results obtained with this method are limited to the largest computationally feasible basis space. We will show 