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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

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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

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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.