code: def __len__(self):
      return self.data.size(0) // self.seq_len
  
file_path: performer-pytorch/examples/enwik8_deepspeed/train.py
imports: import deepspeed
  from performer_pytorch import PerformerLM
  from performer_pytorch.autoregressive_wrapper import AutoregressiveWrapper
  import argparse
  import random
  import tqdm
  import gzip
  import numpy
  import torch
  import torch.optim
  from torch.nn import functional
  from torch.utils.data import DataLoader, Dataset
label_desc: Use image node_id 3 for calling the TextSamplerDataset obj's underlying member method code with example usage: obj.__len__() and returns: unknown