This is an old problem, see e.g.:
https://www.cs.berkeley.edu/~russell/papers/ifsa01-identity.pdf
for special cases. Both google and facebook are very interested in versions of this problem.
This is an old problem, see e.g.:
https://www.cs.berkeley.edu/~russell/papers/ifsa01-identity.pdf
for special cases. Both google and facebook are very interested in versions of this problem.