Bigml

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- Changing Fields object constructor to accept also source, dataset or model
resources.

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- Changing error message when create_source calls result in http errors
to standarize them.
- Simplifying create_prediction calls because now API accepts field names
as input_data keys.
- Adding missing_counts and error_counts to report the missing values and
error counts per field in the dataset.

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- Adding error to regression local predictions using proportional missing
strategy.

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- Adding proportional missing strategy to MultiModel and solving tie breaks
in remote predictions.
- Adding new output options to model's python, rules and tableau outputs:
ability to extract the branch of the model leading to a certain node with
or without the hanging subtree.
- Adding HTTP_TOO_MANY_REQUESTS error handling in REST API calls.

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- Adding Tableau-ready ouput to local model code generators.

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- Fixing getters: getter for batch predictions was missing.