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Incorporated the suggested changes.

Change in Object Dectection Model. Change parameter name given to RewriterConfig Proto. optimize_tensor_layout was changed to layout_optimizer in current tf version.

Conflicts with comment on following line, the comment is correct.

* add configs corresponding to new models in the zoo.
* add warinings aboud version in notebook.

add interpolated scale at a give aspect ratio. This change breaks
the existing checkpoints because the anchor orders are different.

This change should be merged along newly generated frozen ssd models.

Fix nasnet image classification and object detection by moving the
option to turn ON or OFF batch norm training into it's own arg_scope
used only by detection