def test_exists(self, new_data):
"""Test `exists` method invocation"""
data_set = MemoryDataSet()
assert not data_set.exists()
data_set.save(new_data)
assert data_set.exists()
class CachedDataSet(AbstractDataSet):
"""``CachedDataSet`` is a dataset wrapper which caches in memory the data saved,
so that the user avoids io operations with slow storage media.
You can also specify a ``CachedDataSet`` in catalog.yml:
::
>>> test_ds:
>>> type: kedro.contrib.io.cached.CachedDataSet
>>> versioned: true
>>> dataset:
>>> type: CSVLocalDataSet
>>> filepath: example.csv
Please note that if your dataset is versioned, this should be indicated in the wrapper
class as shown above.
"""
def __init__(self,
dataset: Union[AbstractDataSet, Dict],
version: Version = None):
warn(
"kedro.contrib.io.cached.CachedDataSet will be deprecated in future releases. "
"Please refer to replacement dataset in kedro.io.",
DeprecationWarning,
)
if isinstance(dataset, Dict):
self._dataset = self._from_config(dataset, version)
elif isinstance(dataset, AbstractDataSet):
self._dataset = dataset
else:
raise ValueError(
"The argument type of `dataset` should be either a dict/YAML "
"representation of the dataset, or the actual dataset object.")
self._cache = MemoryDataSet()
def _release(self) -> None:
self._cache.release()
self._dataset.release()
@staticmethod
def _from_config(config, version):
if VERSIONED_FLAG_KEY in config:
raise ValueError(
"Cached datasets should specify that they are versioned in the "
"`CachedDataSet`, not in the wrapped dataset.")
if version:
config[VERSIONED_FLAG_KEY] = True
return AbstractDataSet.from_config("_cached", config, version.load,
version.save)
return AbstractDataSet.from_config("_cached", config)
def _describe(self) -> Dict[str, Any]:
return {
"dataset": self._dataset._describe(), # pylint: disable=protected-access
"cache": self._cache._describe(), # pylint: disable=protected-access
}
def _load(self):
data = self._cache.load() if self._cache.exists(
) else self._dataset.load()
if not self._cache.exists():
self._cache.save(data)
return data
def _save(self, data: Any) -> None:
self._dataset.save(data)
self._cache.save(data)
def _exists(self) -> bool:
return self._cache.exists() or self._dataset.exists()
def __getstate__(self):
# clearing the cache can be prevented by modifying
# how parallel runner handles datasets (not trivial!)
logging.getLogger(__name__).warning("%s: clearing cache to pickle.",
str(self))
self._cache.release()
return self.__dict__
class MLflowDataSet(AbstractDataSet):
"""``MLflowDataSet`` saves data to, and loads data from MLflow.
You can also specify a ``MLflowDataSet`` in catalog.yml:
::
>>> test_ds:
>>> type: MLflowDataSet
>>> dataset: pkl
"""
def __init__(
self,
dataset: Union[AbstractDataSet, Dict, str] = None,
filepath: str = None,
dataset_name: str = None,
saving_tracking_uri: str = None,
saving_experiment_name: str = None,
saving_run_id: str = None,
loading_tracking_uri: str = None,
loading_run_id: str = None,
caching: bool = True,
copy_mode: str = None,
file_caching: bool = True,
):
"""
dataset: A Kedro DataSet object or a dictionary used to save/load.
If set to either {"json", "csv", "xls", "parquet", "png", "jpg", "jpeg", "img",
"pkl", "txt", "yml", "yaml"}, dataset instance will be created accordingly with
filepath arg.
If set to "p", the value will be saved/loaded as a parameter (string).
If set to "m", the value will be saved/loaded as a metric (numeric).
If None (default), MLflow will not be used.
filepath: File path, usually in local file system, to save to and load from.
Used only if the dataset arg is a string.
If None (default), `<temp directory>/<dataset_name arg>.<dataset arg>` is used.
dataset_name: Used only if the dataset arg is a string and filepath arg is None.
If None (default), Python object ID is used, but recommended to overwrite by
a Kedro hook.
saving_tracking_uri: MLflow Tracking URI to save to.
If None (default), MLFLOW_TRACKING_URI environment variable is used.
saving_experiment_name: MLflow experiment name to save to.
If None (default), new experiment will not be created or started.
Ignored if saving_run_id is set.
saving_run_id: An existing MLflow experiment run ID to save to.
If None (default), no existing experiment run will be resumed.
loading_tracking_uri: MLflow Tracking URI to load from.
If None (default), MLFLOW_TRACKING_URI environment variable is used.
loading_run_id: MLflow experiment run ID to load from.
If None (default), current active run ID will be used if available.
caching: Enable caching if parallel runner is not used. True in default.
copy_mode: The copy mode used to copy the data. Possible
values are: "deepcopy", "copy" and "assign". If not
provided, it is inferred based on the data type.
Ignored if caching arg is False.
file_caching: Attempt to use the file at filepath when loading if no cache found
in memory. True in default.
"""
self.dataset = dataset or MemoryDataSet()
self.filepath = filepath
self.dataset_name = dataset_name
self.saving_tracking_uri = saving_tracking_uri
self.saving_experiment_name = saving_experiment_name
self.saving_run_id = saving_run_id
self.loading_tracking_uri = loading_tracking_uri
self.loading_run_id = loading_run_id
self.caching = caching
self.file_caching = file_caching
self.copy_mode = copy_mode
self._dataset_name = str(id(self))
if isinstance(dataset, str):
if (dataset not in {"p", "m"}) and (dataset not in dataset_dicts):
raise ValueError(
"`dataset`: {} not supported. Specify one of {}.".format(
dataset, list(dataset_dicts.keys())))
self._ready = False
self._running_parallel = None
self._cache = None
def _init_dataset(self):
if not getattr(self, "_ready", None):
self._ready = True
self.dataset_name = self.dataset_name or self._dataset_name
_dataset = self.dataset
if isinstance(self.dataset, str):
dataset_dict = dataset_dicts.get(
self.dataset, {"type": "pickle.PickleDataSet"})
dataset_dict["filepath"] = self.filepath = (
self.filepath or tempfile.gettempdir() + "/" +
self.dataset_name + "." + self.dataset)
_dataset = dataset_dict
if isinstance(_dataset, dict):
self._dataset = AbstractDataSet.from_config(
self._dataset_name, _dataset)
elif isinstance(_dataset, AbstractDataSet):
self._dataset = _dataset
else:
raise ValueError(
"The argument type of `dataset` should be either a dict/YAML "
"representation of the dataset, or the actual dataset object."
)
_filepath = getattr(self._dataset, "_filepath", None)
if _filepath:
self.filepath = str(_filepath)
if self.caching and (not self._running_parallel):
self._cache = MemoryDataSet(copy_mode=self.copy_mode)
def _release(self) -> None:
self._init_dataset()
self._dataset.release()
if self._cache:
self._cache.release()
def _describe(self) -> Dict[str, Any]:
return {
"dataset":
self._dataset._describe()
if getattr(self, "_ready", None) else self.dataset, # pylint: disable=protected-access
"filepath":
self.filepath,
"saving_tracking_uri":
self.saving_tracking_uri,
"saving_experiment_name":
self.saving_experiment_name,
"saving_run_id":
self.saving_run_id,
"loading_tracking_uri":
self.loading_tracking_uri,
"loading_run_id":
self.loading_run_id,
}
def _load(self):
self._init_dataset()
if self._cache and self._cache.exists():
return self._cache.load()
if self.file_caching and self._dataset.exists():
return self._dataset.load()
import mlflow
client = mlflow.tracking.MlflowClient(
tracking_uri=self.loading_tracking_uri)
self.loading_run_id = self.loading_run_id or mlflow.active_run(
).info.run_id
if self.dataset in {"p"}:
run = client.get_run(self.loading_run_id)
value = run.data.params.get(self.dataset_name, None)
if value is None:
raise KeyError("param '{}' not found in run_id '{}'.".format(
self.dataset_name, self.loading_run_id))
PickleDataSet(filepath=self.filepath).save(value)
elif self.dataset in {"m"}:
run = client.get_run(self.loading_run_id)
value = run.data.metrics.get(self.dataset_name, None)
if value is None:
raise KeyError("metric '{}' not found in run_id '{}'.".format(
self.dataset_name, self.loading_run_id))
PickleDataSet(filepath=self.filepath).save(value)
else:
p = Path(self.filepath)
dst_path = tempfile.gettempdir()
downloaded_path = client.download_artifacts(
run_id=self.loading_run_id,
path=p.name,
dst_path=dst_path,
)
if Path(downloaded_path) != p:
Path(downloaded_path).rename(p)
return self._dataset.load()
def _save(self, data: Any) -> None:
self._init_dataset()
self._dataset.save(data)
if self._cache:
self._cache.save(data)
if find_spec("mlflow"):
import mlflow
if self.saving_tracking_uri:
mlflow.set_tracking_uri(self.saving_tracking_uri)
if self.saving_run_id:
mlflow.start_run(run_id=self.saving_run_id)
elif self.saving_experiment_name:
experiment_id = mlflow.get_experiment_by_name(
self.saving_experiment_name).experiment_id
mlflow.start_run(run_id=self.saving_run_id,
experiment_id=experiment_id)
if self.dataset in {"p"}:
mlflow_log_params({self.dataset_name: data})
elif self.dataset in {"m"}:
mlflow_log_metrics({self.dataset_name: data})
else:
mlflow_log_artifacts([self.filepath])
if self.saving_run_id or self.saving_experiment_name:
mlflow.end_run()
def _exists(self) -> bool:
self._init_dataset()
if self._cache:
return self._cache.exists()
else:
return False
def __getstate__(self):
return self.__dict__
