[ColinWright]

Changing topic area for a PhD is hard work, but usually of significant value, because you have insights into each from the other. As such, the work provides a return. But it's hard work.

Will the PhD be of net positive value? In some fields, to have a PhD is of net negative value (although perhaps only initially) because potential employers will believe you have only book-learning experience, and are of no practical use.

Do you want to do a PhD? Why? It's hard work, extremely frustrating, and usually somewhat marginal. If you work on truly mainstream material there is always a chance someone will publish before you and potentially prevent you from getting the PhD.

So if you really want to do it, then go for it, but start by understanding your reasons and motivations. Certainly ML is a rich field, full of as-yet-undiscovered techniques and algorithms, and undoubtedly useful. But remember, a PhD is not the only way to get into a field - another path might be better. Don't be excessively tempted for the initially easy option.

[0x8416]

Thanks so much for taking out your time to reply. I agree with you a 100% in all you have pointed out.

I had plan to either focus on Cisco Certifications (got a few certs already) and build up my career from there or go for a Phd in SDN or ML.

However i have decided to just learn ML (coursera) on weekends or whatever and focus on certifications while working.

What do you think?

[ColinWright]

I really can't say. I wouldn't want to think I'd put you off doing a PhD if that's really the best thing for you, but I can't judge if it would be. Only you can judge that, and all I'm trying to do is give you more information about what it is like. I'm really pleased I did a PhD, but it really isn't for everyone, it really is hard, and it really might not be of value to you.

But it might be. Weigh the possibilities. By all means start to apply the discipline you would need to start some self-study and see where it goes.

And whatever you decide, good luck!

[0x8416]

You are not putting me off because i have been thinking about it hence the reason i decided to post it.

I will be applying to a University in Australia, New Zealand or Canada. Also it has to be on scholarship which i read is quite competitive.

Thank you for all the information, i will be looking at all options closely. Thank you again.