How do you set the best parameter for pic?

MIT App Inventor Help
1

hi everybody
how to choose the best parameter for pic ? which is better 0.0001 or 0.01 learning rate ? adam,sgd ,adadelta which is better ? which is better 20 or 2000 for epoch ? fraction rate is for what ?
thank you for the explanation

2

What is a pic?

3

Personal image classifier