class_docstr: Fully materialized layer of `Layer`
  
  Parameters
  ----------
  mapping: Mapping
      The mapping between keys and tasks, typically a dask graph.
class_docstr_tok: ["Fully","materialized","layer","of","`","Layer","`","Parameters","--","--","--","--","--","mapping",":","Mapping","The","mapping","between","keys","and","tasks",",","typically","a","dask","graph","."]
code: def get_output_keys(self):
      return self.keys()
  
imports: from __future__ import annotations
  import abc
  import copy
  import html
  from collections.abc import Collection, Hashable, ItemsView, Iterable, Iterator, KeysView, Mapping, Sequence, Set, ValuesView
  from typing import Any
  import tlz
  import dask
  from dask import config
  from dask.base import clone_key, flatten, is_dask_collection
  from dask.core import keys_in_tasks, reverse_dict
  from dask.typing import DaskCollection, Graph, Key
  from dask.utils import ensure_dict, import_required, key_split
  from dask.widgets import get_template
label_desc: Use image node_id 7 for calling the MaterializedLayer obj's underlying member method code with example usage: obj.get_output_keys() and returns: self