I've been trying out Google's Cloud Vision API (https://cloud.google.com/vision) as a means of detecting NSFW content in user-submitted images but am finding it surprisingly unreliable. A large proportion of requests appear to just randomly hang before timing out with no error.I'm looking for recommendations for an alternative solution which can flag images containing pornography, gore, violence, etc. All the bad stuff.
What should I be looking at? Are there any I should avoid?