Bug in experiments.py

[liuyang21cn]

File "training_speed/experiments.py", line 126
return ''.join(map(lambda (key, value): '{}[{}]'.format(key, str(value)), params.items()))

SyntaxError: invalid syntax

I'm using python 3 and it gave me this warning on the use of lmabda.

[nottatdat]

Please take a look at this PR #10 and modify your code accordingly (as it have not been merged).

[annaveronika]

The PR is merged, thank you very much for your contribution!