__init__(self, checkpoint_file=None, allowed_keys=None, omitted_keys=None): 

LLM Docstring

Initialize a checkpointer that deliberately stores no values.

• checkpoint_file: object

  path or file-like checkpoint target

• allowed_keys: object

  optional whitelist of permitted top-level keys

• omitted_keys: object

  optional blacklist of top-level keys

• :returns: None

  No explicit value; the method mutates state or performs I/O.

open_checkpoint_file(self, chk): 

Opens the passed checkpoint_file (if not already open)

• chk: str | file-like

• :returns: _

close_checkpoint_file(self, stream): 

Opens the passed checkpoint_file (if not already open)

• chk: Any

• :returns: _

save_parameter(self, key, value): 

Saves a parameter to the checkpoint file

• key: Any

• value: Any

• :returns: _

load_parameter(self, key): 

Loads a parameter from the checkpoint file

• key: Any

• :returns: _

delete_parameter(self, key): 

Loads a parameter from the checkpoint file

• key: Any

• :returns: _

keys(self): 

LLM Docstring

Return an empty key list because the null backend never retains data.

• :returns: collections.abc.KeysView | collections.abc.ItemsView | collections.abc.ValuesView | list

  A view or list of the requested registry, cache, checkpoint, or mapping entries.