NDArray API NN Optimizer (Multi-* update category) issues

[ChaiBapchya]

Neural Network Optimizer updates such as
multi_mp_sgd_mom_update, multi_mp_sgd_update, multi_sgd_mom_update, multi_sgd_update

They are present in Symbol API doc but not in NDArray API doc.
However, upon checking definition of 1 of the operators

>>> help(mx.nd.multi_sgd_mom_update)

Help on function multi_sgd_mom_update:

multi_sgd_mom_update(*data, **kwargs)
    Momentum update function for Stochastic Gradient Descent (SGD) optimizer.
    
    Momentum update has better convergence rates on neural networks. Mathematically it looks
    like below:
    
    .. math::
    
      v_1 = \alpha * \nabla J(W_0)\\
      v_t = \gamma v_{t-1} - \alpha * \nabla J(W_{t-1})\\
      W_t = W_{t-1} + v_t
    
    It updates the weights using::
    
      v = momentum * v - learning_rate * gradient
      weight += v
    
    Where the parameter ``momentum`` is the decay rate of momentum estimates at each epoch.
    
    
    
    Defined in src/operator/optimizer_op.cc:L372
    
    Parameters
    ----------
    data : NDArray[]
        Weights, gradients and momentum
    lrs : tuple of <float>, required
        Learning rates.
    wds : tuple of <float>, required
        Weight decay augments the objective function with a regularization term that penalizes large weights. The penalty scales with the square of the magnitude of each weight.
    momentum : float, optional, default=0
        The decay rate of momentum estimates at each epoch.
    rescale_grad : float, optional, default=1
        Rescale gradient to grad = rescale_grad*grad.
    clip_gradient : float, optional, default=-1
        Clip gradient to the range of [-clip_gradient, clip_gradient] If clip_gradient <= 0, gradient clipping is turned off. grad = max(min(grad, clip_gradient), -clip_gradient).
    num_weights : int, optional, default='1'

[mxnet-label-bot]

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[ChaiBapchya]

@mxnet-label-bot add [Operator, Doc]

[ChaiBapchya]

Looked at the wrong branch in the doc.
Found here -
http://mxnet.incubator.apache.org/versions/master/api/python/ndarray/ndarray.html#mxnet.ndarray.multi_mp_sgd_mom_update

Important to navigate to the Master branch in the Versions dropdown of the Home page of the website.