About negative sampling method

[rww94]

I found that the negative samples selected in the negative sampling method here may be the same as the positive example.
//indices = np.random.randint(low=0, high=len(self.table), size=count)
The index value generated by this line of code may be the same as the token

[eduOS]

I thought if your vocabulary is large enough that would happen but only happen once in a blue moon.