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Abstract base class for different Scalarizers.

The Scalarizer class is a callable that transforms multiple objectives into a single scalar reward.

num_of_objectives A non-negative integer indicating the number of objectives to scalarize.

ValueError if not isinstance(num_of_objectives, int).
ValueError if num_of_objectives < 2.



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Setter method for scalarization parameters.


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Returns a single reward by scalarizing multiple objectives.

multi_objectives A Tensor of shape [batch_size, number_of_objectives], where each column represents an objective.

Returns: A Tensor of shape [batch_size] representing scalarized rewards.

ValueError if multi_objectives.shape.rank != 2.
ValueError if multi_objectives.shape.dims[1] != self._num_of_objectives.