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Inplace variable fix

Javier Duarte requested to merge github/fork/jmitrevs/inplace_variable_fix into master

Created by: jmitrevs

This pull request fixes the reference of an InplaceVariable when optimizers remove the reference. It was reported in Issue #263 (closed).

The solution adds an update_inplace_variables member function to Layers, with the default implementation being just pass. If a layer does have an InplaceVariable, however, it must update the reference. Such a function is implemented for the Reshape layer.

The added pytest fails in the current main branch, but succeeds with this fix.

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