Resolve "HepNet save fails because of missing keras dependence"

Closes #49 (closed)

added Type::Bug label

added 1 commit

• 7484e8bf - Implement and test HepNet save()

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added 1 commit

• 9fd442a9 - Add tensorflow dependency

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assigned to @fsauerbu

unmarked as a Work In Progress

added 2 commits

• 85c72101 - Test model load/save
• d8eded76 - Add history to saved HepNet

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merged