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In-memory DataSet initiated without feed_dict are saved in TF graph def,
causing exported graph.pbtxt over-bloated.
Change to FixedLengthRecordDataSet and does a few refactorization.

A TODO was stated for adding LRN - Pending GPU support.
LRN was implemented by tensorflow/tensorflow@35df3ed43edabbc4ad1b2439bbc7de8917026d6e

Hyper-parameters taken from http://papers.nips.cc/paper/4824-imagenet-classification-with-deep-convolutional-neural-networks

2. Fixed accuracy when calcuting logs more than 10 steps

Without the new variable_scope, creating apply_gradient_op raises
an error that additional moving average or slot variables could not
be created. This is because of the 'leaky reuse' of variable scope,
so we correct the problem by explicitly introducing a new variable scope.

Related issues: tensorflow/models#901, tensorflow/tensorflow#6220

Updated the cifar10 model to match the internal version and to be compatible with the latest version of TensorFlow

Fixes #893

Fixes #857.

bug fix for contrib.deprecated eliminatation in tf version 12.

bug fix for contrib.deprecated eliminatation in tf version 12.

bug fix for contrib.deprecated eliminatation in tf version 12.