please port this implementation of epinets into jax keep it as similar as possible to the original code. you are provided with a jax implementation of mnist to help you.
- come up with a plan that includes a estimated #LOC modified or e#LOCm.
- if a line requires more than 30 e#LOCm then you should divide it into two parts or more. This is so I could see what you are doing. The division allows me to see your output, you should say what you did after each modification and think ahead to the next modification.