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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def subtract_imagenet_mean_preprocess_batch(batch):
 """Subtract ImageNet mean pixel-wise from a BGR image."""

    batch = F.swapaxes(batch,0, 1)
    (r, g, b) = F.split(batch, num_outputs=3, axis=0)
    r = r - 123.680
    g = g - 116.779
    b = b - 103.939
    batch = F.concat(b, g, r, dim=0)
    batch = F.swapaxes(batch,0, 1)
    return batch