import platform
from pathlib import Path

import numpy as np
import torch

from spconv.pytorch import ops
from spconv.pytorch.conv import (SparseConv2d, SparseConv3d, SparseConvTranspose2d,
                         SparseConvTranspose3d, SparseInverseConv2d,
                         SparseInverseConv3d, SubMConv2d, SubMConv3d)
from spconv.pytorch.core import SparseConvTensor
from spconv.pytorch.identity import Identity
from spconv.pytorch.modules import SparseModule, SparseSequential
from spconv.pytorch.ops import ConvAlgo
from spconv.pytorch.pool import SparseMaxPool2d, SparseMaxPool3d
from spconv.pytorch.tables import AddTable, ConcatTable, JoinTable


class ToDense(SparseModule):
    """convert SparseConvTensor to NCHW dense tensor.
    """
    def forward(self, x: SparseConvTensor):
        return x.dense()


class RemoveGrid(SparseModule):
    """remove pre-allocated grid buffer.
    """
    def forward(self, x: SparseConvTensor):
        x.grid = None
        return x

import platform
from pathlib import Path

import numpy as np
import torch

from spconv.pytorch import ops
from spconv.pytorch.conv import (SparseConv2d, SparseConv3d, SparseConvTranspose2d,
                         SparseConvTranspose3d, SparseInverseConv2d,
                         SparseInverseConv3d, SubMConv2d, SubMConv3d)
from spconv.pytorch.core import SparseConvTensor
from spconv.pytorch.identity import Identity
from spconv.pytorch.modules import SparseModule, SparseSequential
from spconv.pytorch.ops import ConvAlgo
from spconv.pytorch.pool import SparseMaxPool2d, SparseMaxPool3d
from spconv.pytorch.tables import AddTable, ConcatTable, JoinTable


class ToDense(SparseModule):
    """convert SparseConvTensor to NCHW dense tensor.
    """
    def forward(self, x: SparseConvTensor):
        return x.dense()


class RemoveGrid(SparseModule):
    """remove pre-allocated grid buffer.
    """
    def forward(self, x: SparseConvTensor):
        x.grid = None
        return x

convert SparseConvTensor to NCHW dense tensor. remove pre-allocated grid buffer.