'Call all registered callbacks\' on_minibatch_end functions.
Arguments:
epoch (int): index of current epoch
minibatch (int): index of minibatch that is ending'

def on_minibatch_end(self, epoch, minibatch):

    for c in self.callbacks:
        if c.should_fire(self.callback_data, self.model(), minibatch, c.minibatch_freq):
            c.on_minibatch_end(self.callback_data, self.model(), epoch, minibatch)
    self.epoch_minibatches = (minibatch + 1)
