code: def __init__(self):
      self._hashes = dict()
  
file_path: snakemake/snakemake/caching/hash.py
imports: import hashlib
  import json
  from snakemake.jobs import Job
  from snakemake import script
  from snakemake import wrapper
  from snakemake.exceptions import WorkflowError
  from snakemake.settings import DeploymentMethod
label_desc: Use image node_id 1 to create a new ProvenanceHashMap object  with example: obj = ProvenanceHashMap()