How to use the pyntcloud.samplers.base.Sampler function in pyntcloud

from .base import Sampler

import numpy as np
import pandas as pd


class PointsSampler(Sampler):
    """
    """
    def extract_info(self):
        self.points = self.pyntcloud.points


class RandomPointsSampler(PointsSampler):
    """
    Parameters
    ----------
    n: int
        Number of unique points that will be chosen.
    """

    def __init__(self, *, pyntcloud, n):
        super().__init__(pyntcloud=pyntcloud)

import numpy as np
import pandas as pd
from scipy.spatial import cKDTree
from .base import Sampler


class Sampler_Voxelgrid(Sampler):
    """
    """

    def __init__(self, pyntcloud, voxelgrid):
        super().__init__(pyntcloud)
        self.voxelgrid = voxelgrid

    def extract_info(self):
        self.voxelgrid = self.pyntcloud.structures[self.voxelgrid]


class VoxelgridCenters(Sampler_Voxelgrid):
    """Returns the points that represent each occupied voxel's center."""
    def compute(self):
        s = self.voxelgrid.voxel_centers[np.unique(self.voxelgrid.voxel_n)]
        return pd.DataFrame(s, columns=["x", "y", "z"])

import numpy as np
import pandas as pd

from scipy.spatial.distance import cdist

from .base import Sampler


class VoxelgridSampler(Sampler):
    def __init__(self, *, pyntcloud, voxelgrid_id):
        super().__init__(pyntcloud=pyntcloud)
        self.voxelgrid_id = voxelgrid_id

    def extract_info(self):
        self.voxelgrid = self.pyntcloud.structures[self.voxelgrid_id]


class VoxelgridCentersSampler(VoxelgridSampler):
    """Returns the points that represent each occupied voxel's center."""
    def compute(self):
        return pd.DataFrame(
            self.voxelgrid.voxel_centers[np.unique(self.voxelgrid.voxel_n)],
            columns=["x", "y", "z"])

import numpy as np
import pandas as pd

from .base import Sampler
from ..geometry.areas import triangle_area_multi


class MeshSampler(Sampler):
    """
    """

    def __init__(self, *, pyntcloud, rgb=False, normals=False):
        super().__init__(pyntcloud=pyntcloud)
        self.rgb = rgb
        self.normals = normals

    def extract_info(self):
        v1, v2, v3 = self.pyntcloud.get_mesh_vertices(
            rgb=self.rgb, normals=self.normals)

        self.v1_xyz = v1[:, :3]
        self.v2_xyz = v2[:, :3]
        self.v3_xyz = v3[:, :3]