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"""``NetworkXLocalDataSet`` loads and saves graphs to a local JSON file format using ``NetworkX``.
"""
import json
from pathlib import Path
from typing import Any, Dict
import networkx
from kedro.contrib.io import DefaultArgumentsMixIn
from kedro.io import AbstractVersionedDataSet, Version
from kedro.io.core import deprecation_warning
[docs]class NetworkXLocalDataSet(DefaultArgumentsMixIn, AbstractVersionedDataSet):
"""``NetworkXLocalDataSet`` loads and saves graphs to a local JSON file format
using ``NetworkX``. See https://networkx.github.io/documentation/stable/tutorial.html
for details.
Example:
::
>>> from kedro.contrib.io.networkx import NetworkXLocalDataSet
>>> import networkx as nx
>>> graph = nx.complete_graph(100)
>>> graph_dataset = NetworkXLocalDataSet(filepath="test.json")
>>> graph_dataset.save(graph)
>>> reloaded = graph_dataset.load()
>>> assert nx.is_isomorphic(graph, reloaded)
"""
[docs] def __init__(
self,
filepath: str,
load_args: Dict[str, Any] = None,
save_args: Dict[str, Any] = None,
version: Version = None,
) -> None:
"""Creates a new instance of ``NetworkXLocalDataSet``.
Args:
filepath: The path to the NetworkX graph JSON file.
load_args: Arguments passed on to ```networkx.node_link_graph``.
See the details in
https://networkx.github.io/documentation/networkx-1.9.1/reference/generated/networkx.readwrite.json_graph.node_link_graph.html
save_args: Arguments passed on to ```networkx.node_link_data``.
See the details in
https://networkx.github.io/documentation/networkx-1.9.1/reference/generated/networkx.readwrite.json_graph.node_link_data.html
version: If specified, should be an instance of
``kedro.io.core.Version``. If its ``load`` attribute is
None, the latest version will be loaded. If its ``save``
attribute is None, save version will be autogenerated.
"""
deprecation_warning(self.__class__.__name__)
super().__init__(
filepath=Path(filepath),
load_args=load_args,
save_args=save_args,
version=version,
)
def _load(self) -> networkx.Graph:
load_path = Path(self._get_load_path())
json_payload = json.loads(load_path.read_text())
graph = networkx.node_link_graph(json_payload, **self._load_args)
return graph
def _save(self, data: networkx.Graph) -> None:
save_path = Path(self._get_save_path())
save_path.parent.mkdir(parents=True, exist_ok=True)
json_graph = networkx.node_link_data(data, **self._save_args)
with save_path.open("w") as output_file:
json.dump(json_graph, output_file)
def _exists(self) -> bool:
path = self._get_load_path()
return Path(path).is_file()
def _describe(self) -> Dict[str, Any]:
return dict(
filepath=self._filepath,
load_args=self._load_args,
save_args=self._save_args,
version=self._version,
)