Function radam_sgd_step 

pub fn radam_sgd_step<T: Triton, const BLOCK_SIZE: i32>(
    params_ptr: T::Pointer<f32>,
    grad_ptr: T::Pointer<f32>,
    exp_avg_ptr: T::Pointer<f32>,
    exp_avg_sq_ptr: T::Pointer<f32>,
    n_elements: i32,
    step_size: f32,
    beta1: f32,
    beta2: f32,
    weight_decay: f32,
)
where
    T::I32Tensor: Tensor<i32, 1> + Comparison<i32, BoolTensor = T::BoolTensor>,
    T::Pointer<f32>: AddOffsets<i32, 1, T::I32Tensor, Output = T::Tensor<T::Pointer<f32>>>,

RAdam step — SGD fallback phase (rho_t <= 5).

exp_avg    = beta1 * exp_avg    + (1 - beta1) * g
exp_avg_sq = beta2 * exp_avg_sq + (1 - beta2) * g²   (state updated but unused)
p         -= step_size * exp_avg

step_size = lr / bias_correction1 is precomputed on host.

Grid: [ceil(n_elements / BLOCK_SIZE), 1, 1].