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update dsml workshop to use optuna or raytune in place of hyperopt  #17

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@nbhushan

The open-source version of Hyperopt is no longer being maintained and Hyperopt will be removed in the next major DBR ML version (17).

from hyperopt import hp, tpe, fmin, STATUS_OK, Trials

Databricks recommends using either Optuna for single-node optimization or RayTune for a similar experience to the deprecated Hyperopt distributed hyperparameter tuning functionality.
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