(self, batch_size_per_image, positive_fraction)
Arguments:
            batch_size_per_image (int): number of elements to be selected per image
            positive_fraction (float): percentace of positive elements per batch
Arguments:
            batch_size_per_image (int): number of elements to be selected per image
            positive_fraction (float): percentace of positive elements per batch
Arguments : batch_size_per_image ( int ) : number of elements to be selected per image positive_fraction ( float ) : percentace of positive elements per batch
def __init__(self, batch_size_per_image, positive_fraction):
        """
        Arguments:
            batch_size_per_image (int): number of elements to be selected per image
            positive_fraction (float): percentace of positive elements per batch
        """
        self.batch_size_per_image = batch_size_per_image
        self.positive_fraction = positive_fraction
def __init__ ( self , batch_size_per_image , positive_fraction ) : self . batch_size_per_image = batch_size_per_image self . positive_fraction = positive_fraction