Presence Penalty is between -2.0 and 2.0 and it impacts how the Omni AI penalizes new tokens based on whether they have appeared in the text so far.
Positive values will increase the likelihood of the Omni AI talking about new topics by penalizing new tokens that have already been used.
The presence penalty is a one-time, additive contribution that applies to all tokens that have been sampled at least once, while the frequency penalty is a contribution that is proportional to how often a specific token has already been sampled.
In general, the default value for Presence Penalty is 0 and it's used when you want to generate text that is coherent with the input prompt, by using words that are present in the input.
On the other hand, if you want the Omni AI to generate text that is less restricted by the input, you might want to use a higher presence penalty, this will encourage the AI to generate novel words that were not present in the input, allowing for more diverse and creative output.