import torch, torch.nn as nn
from vector_quantize_pytorch import ResidualVQ
class RVQWrapper(nn.Module):
    def __init__(self, dim, num_quantizers, codebook_size):
        super().__init__()
        self.proj_in  = nn.Linear(dim, dim, bias=True)
        self.rvq      = ResidualVQ(dim=dim, num_quantizers=num_quantizers, codebook_size=codebook_size)
        self.proj_out = nn.Linear(dim, dim, bias=True)
        self.register_buffer('ema_counts', torch.zeros(num_quantizers, codebook_size))
    def forward(self, x):
        x = self.proj_in(x)
        y, indices, commit = self.rvq(x)
        y = self.proj_out(y)
        return y, indices, commit