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Change: 125780396

Fix a flaky test by computing half-precision gamma samples with float precision intermediate calculations.
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Also updated the weight initialization to ensure that the initial weights are likely to be greater than the smaller possible value representable using a 16 bit float (~0.00006).
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One TODO for DirichletMultinomial.
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RE the bugfix, I noticed that my tf.slim loss metric is worse than my training loss, and I'm guessing it's because my model is evaluated concurrent with its variables being loaded from a checkpoint.
I'm running now to see if this fixes things.
Feel free to ignore this CL until then.
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Added max_steps into training. Distributed training will use max_steps instead of incremental steps.
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Add more unit tests for BaseEstimator/Estimator (and one for tensor_signature). Fix bug if no targets used in training. Factor out some repeated code for better test coverage.
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Upgraded Eigen to the latest version that provides new scan operations. This will enable the implementation of the cumsum operation in TensorFlow
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Write code to build and register entrywise unary transforms. Create transforms for unary TF arithmetic ops.
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In some cases TensorFlow reads the data via RandomAccessFile in really small
chunks, which doesn't work very efficiently with HTTP requests. Adding a
read-ahead cache significantly boosts the performance.
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non-deterministic.
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Add tests to assert all update_op tensors returned from metric_ops produce the proper metric value, and fix streaming_auc to do so.
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