import torch


def draw_r(ps:int, ci: int, N: int, X):
    """
    Draws a simple random multi-channel probing matrix.

    Arguments:
        ps (int): Number of probing vectors.
        ci (int): Number of input channels.
        N (int): Number of pixels.
        X (tensor): Input tensor (untouched, used for device detection).
    """
    return torch.randn(ci*N, ps, device=X.device)