1. The complexity analysis is insufficient. In the draft, the author only provide the rough overall complexity. A better way is to show the comparison between the proposed method and some other methods, including the number of model parameter and network forwarding time.
2. In the converting of point cloud to concentric spherical signal, the Gaussian radial basis function is adopted to summarize the contribution of points. Is there any other function that can accomplish this job? The reviewer would like to the discussion about this.
3. The Figure 2 is a little ambiguous, where some symbols are not explained clearly. And the reviewer is curious about that whether there is information redundancy and interference in the multi-sphere icosahedral discretization process.
4. There are some typos in the draft. The first is the wrong use of "intra-sphere" and "inter-sphere". The second is the use of two consecutive "stacking" in the Spherical Discretization subsection. Please check the full text carefully.
5. The center choice of the concentric spheres should be discussed both theoretically and experimentally. In the opinion, the center of spheres play a important role in the representation capturing of 3D point clouds in a sphere convolution manner.
3. The Figure 2 is a little ambiguous, where some symbols are not explained clearly. And the reviewer is curious about that whether there is information redundancy and interference in the multi-sphere icosahedral discretization process.