Dataframe is set and transformed multiple times.

[codeninja]

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System information
current master

You can obtain the TensorFlow version with:
python -c "import tensorflow as tf; print(tf.GIT_VERSION, tf.VERSION)"
TF 1.3

Describe the current behavior

The data frame is set, and transformed, multiple times in a single run.

Describe the expected behavior
The data frame should only be set and transformed a single time.

Code to reproduce the issue
Provide a reproducible test case that is the bare minimum necessary to generate the problem.

Other info / logs
Include any logs or source code that would be helpful to diagnose the problem. If including tracebacks, please include the full traceback. Large logs and files should be attached.

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[notadamking]

Fixed in #125