Enforce Required model_type Parameter in Model Class

[lshpaner]

This PR enforces the specification of the model_type parameter (classification or regression) when creating an instance of the Model class. Previously, model_type defaulted to "classification", but this could lead to unintended behavior if the user did not explicitly specify the type of model.

Changes

Removed Default Value for model_type:

• model_type is now a required parameter in the __init__ method of the Model class. Users must specify it when instantiating the class.
• Added Validation Check for model_type:
  • A simple ValueError is raised if model_type is not "classification" or "regression", ensuring that the parameter is set to an accepted value.

  # Check if model_type is provided and valid
  if model_type not in ["classification", "regression"]:
      raise ValueError("You must specify model_type as either 'classification' or 'regression'.")