WIP: Outlier example

[ukclivecox]

• Show multi-stage pipeline
• Removes __get__ methods for class use as not needed if we use the set_cls process to inject self
• Allows class instances to be called as functions
• Adds a deployed state which is set when saving pickle to ensure .remote is called when pipeline is not running locally and needs to call other pipelines
• Fixed use of V2 dataplane on returned objects
• Model needed to be extended so you can use a class rather than function for custom models.

Discussion:

• dill and cloudpickle do not work well together. Dill is used in alibi-detec
• added unload method so can save artifacts without alibi-detect outlier object
• Need a way to get MLServer folder

Remaining issues

• Dependencies for pipelines calling pipelines are transitive so you need the sum of all at present as the pipeline instances are all pulled in by CloudPickle.
• Dill and cloudpickle not playing well together.