Machine learning enthusiasts: what are your biggest challenges training models?

Hi everyone, I'm doing some research around computing needs and development tools for people interested in machine learning and would love to hear about your experience. If you'd be so kind as to provide more detailed information through a survey, here's a link for a google form I created. If I get enough responses, I'll share results with the community: https://goo.gl/forms/F2RDk9TuFVN6XqJh2