Add needs_loss
and needs_training_losses
control traits
#51
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Needs EarlyStopping.jl version 0.3
Adds the traits
needs_loss
,needs_training_losses
that wereremoved from EarlyStopping in v0.3.0
Changes the logic about how these are handled to correct previously
unexpected behaviour discovered in MLJIteration.jl; see this
issue. The
traits have a slightly new interpretation: have
train!
throw anerror if the trait is
true
for some control provided and the modelhas not been overloaded for
loss
/training_losses
.Resolves JuliaAI/MLJIteration.jl#36.