PrincetonUniversity / PsyNeuLink / 14097180779

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Commit Message

Feat/gru (#3234)

• implement GRUComposition class
  includes modifications to handling of BIAS nodes per below

• composition.py
  - correct errors for projections to/from nodes not in the Composition specific to BIAS Nodes
  - exclude BIAS Nodes as INPUT Nodes
  - exclude BIAS Nodes as OUTPUT Nodes 
  - add get_targets() method that returns nodes with NodeRole.TARGET
  - change name of NodeRole.TARGET Mechanisms to use _get_target_name = "TARGET for <Mechanism.name>" 
    add get_targets()  
  - fix bug in which specification of pathway with MappingProjection using sender of a nested Composition but no receiver (so it is placed in deferred_init) use primary OutputPort of the nested Composition's output_CIM, which may be incorrect

• mechanism.py
  _get_variable_from_input: modified to accomodate empty arrays (need for handling in AutodiffComposition)
  
• controlmechanism.py
    - use input_shapes for size of default (OUTCOME) InputPort (to accomodate vector GatingSignals)
      (note: if > 1 for ControlMechanism, causes error in compute_costs
             OK for GatingMechamism, which supports vector GatingSignals)

• port.py
  - _instantiate_projection_from_port(): get spec.reciever from _init_args if port is in deferred_init status
  
• autodiffcomposition.py
  - add torch_dtype attribute, set based on pytorchwrapper class being used (see below)
  - _get_autodiff_targets_values(), _get_autodiff_inputs_values():
    if torch_available, return formatted according to torch_dtype, otherwise return as np.ndarray  
  - refactored to take optmizer_params argument in constructor
  - _get_pytorch_backprop_pathway():  
    add direct Projection from node in outer composition to one to which it projects in nested Composition, so that it can be displayed by show_graph(show_pytorch=True) 

• pytorchwrappers.py:
  - add class attribute torch_dtype (and to sublcasses that need to override it, such as ptyrochGRUwrappers)
  - renamed following attributes as Prote... (continued)

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