Function parallel_step 

pub fn parallel_step<O, A, D>(
    optimizer: &mut O,
    params_list: &[Array<A, D>],
    grads_list: &[Array<A, D>],
) -> Result<Vec<Array<A, D>>>
where
    O: Optimizer<A, D> + Clone + Send + Sync,
    A: Float + ScalarOperand + Debug + Send + Sync,
    D: Dimension,
    Array<A, D>: Clone + Send + Sync,

Helper function to process parameter groups in parallel

This is a convenience function for one-off parallel processing without creating a ParallelOptimizer instance.

Arguments

• optimizer - The optimizer to use (will be cloned for each group)
• params_list - List of parameter arrays
• grads_list - List of gradient arrays

Returns

Updated parameter arrays processed in parallel