it needs enough data. often "enough" is measurable amount, so technically speaking if you had a specific use case you could answer it. but in practical terms,

it needs enough data. often "enough" is measurable amount, so technically speaking if you had a specific use case you could answer it. but in practical terms, there is absolutely no reason training would be done on a smartphone. or any pc for that matter. you only need to train once, then you can use anywhere.