code: def is_beginning_of_word(self, x: str) -> bool:
      return self.decode(x).startswith(" ")
  
file_path: fairseq/fairseq/data/encoders/hf_byte_bpe.py
imports: from dataclasses import dataclass, field
  from fairseq.data.encoders import register_bpe
  from fairseq.dataclass import FairseqDataclass
  from fairseq import file_utils
label_desc: Use image node_id 4 for calling the HuggingFaceByteLevelBPE obj's underlying member method code with example usage: obj.is_beginning_of_word(x) and returns: self