tfx.dsl.components.common.resolver.ResolverStrategy

Base resolver strategy class.

A resolver strategy defines a type behavior used for input selection. A resolver strategy subclass must override the resolve_artifacts() function which takes a dict of > as parameters and return the resolved dict.

Methods

`resolve`

View source

resolve(
    pipeline_info: tfx.orchestration.data_types.PipelineInfo,
    metadata_handler: tfx.orchestration.metadata.Metadata,
    source_channels: Dict[Text, tfx.types.Channel]
) -> tfx.dsl.components.common.resolver.ResolveResult

Resolves artifacts from channels by querying MLMD.

Args
`pipeline_info`	PipelineInfo of the current pipeline. We do not want to query artifacts across pipeline boundary.
`metadata_handler`	a read-only handler to query MLMD.
`source_channels`	a key -> channel dict which contains the info of the source channels.

Returns
a ResolveResult instance.

Raises
`DeprecationWarning`	when it is called.

`resolve_artifacts`

View source

@abc.abstractmethod
resolve_artifacts(
    metadata_handler: tfx.orchestration.metadata.Metadata,
    input_dict: Dict[Text, List[types.Artifact]]
) -> Optional[Dict[Text, List[types.Artifact]]]

Resolves artifacts from channels, optionally querying MLMD if needed.

In asynchronous execution mode, resolver classes may composed in sequence where the resolve_artifacts() result from the previous resolver instance would be passed to the next resolver instance's resolve_artifacts() inputs.

If resolve_artifacts() returns None, it is considered as "no inputs available", and the remaining resolvers will not be executed.

Also if resolve_artifacts() omits any key from the input_dict it will not be available from the downstream resolver instances. General recommendation is to preserve all keys in the input_dict unless you have specific reason.

Args
`metadata_handler`	A metadata handler to access MLMD store.
`input_dict`	The input_dict to resolve from.

Returns
If all entries has enough data after the resolving, returns the resolved input_dict. Otherise, return None.