encoderModel_train_encoder: encoder for scAlign
In scAlign: An alignment and integration method for single cell genomics

Aligns paired data into a joint embedding space.

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encoderModel_train_encoder(FLAGS, CV, config, num_labels, data_shape,
  obj1_name, obj2_name, source_data, source_labels, target_data,
  target_labels)

`FLAGS`	Tensorflow run arguments.
`CV`	Model that is being run.
`config`	Hardware configuration options.
`num_labels`	Number of unique labels.
`data_shape`	Dimensions of input data.
`source_data`	Source data matrix (cell x feature).
`source_labels`	Source data labels.
`target_data`	Target data matrix (cell x feature).
`target_labels`	Target data labels.