import torch
from distutils.version import LooseVersion

is_pytorch_17plus = LooseVersion(torch.__version__) >= LooseVersion("1.7")


def init_weights(m, mean=0.0, std=0.01):
    classname = m.__class__.__name__
    if classname.find("Conv") != -1:
        m.weight.data.normal_(mean, std)


def get_mask_from_lengths(lengths, max_len=None):
    batch_size = lengths.shape[0]
    if max_len is None:
        max_len = torch.max(lengths).item()

    ids = (
        torch.arange(0, max_len).unsqueeze(0).expand(batch_size, -1).to(lengths.device)
    )
    mask = ids >= lengths.unsqueeze(1).expand(-1, max_len)

    return mask