Converts `fluents` to tensors with datatype tf.float32.

def _output(cls, fluents: Sequence[FluentPair]) -> Sequence[tf.Tensor]:
        '''Converts `fluents` to tensors with datatype tf.float32.'''
        output = []
        for _, fluent in fluents:
            tensor = fluent.tensor
            if tensor.dtype != tf.float32:
                tensor = tf.cast(tensor, tf.float32)
            output.append(tensor)
        return tuple(output)