Write some code to calculate all of the visit vectors for a given set of users, by completing the function, def form_visit_vectors(users, checkins, pois): ... according to the following specifications. Inputs: users: User IDs to process, given as a Python set checkins: Check-in records, stored as a dictionary of lists of visit dictionaries (see Part C, Exercise 3) pois: POIs, stored as a dictionary of dictionaries Task: For each user in users, determine which of their visits in checkins has a known POI (meaning it appears in pois). The visit vector of that user will be those POIs. Outputs: Return a Python dictionary of Python sets. The keys are user IDs, and the values are the visit vectors. Notes: The output should only contain visit vectors for users who are in users and checkins. Furthermore, the output should only include visits for POIs that are in pois. Empty inputs and outputs are possible. In Python.

1. Write some code to calculate all of the visit vectors for a given set of users, by completing the
function,
def form_visit_vectors(users, checkins, pois):
...
according to the following specifications.
Inputs:
users: User IDs to process, given as a Python set
checkins: Check-in records, stored as a dictionary of lists of visit dictionaries (see Part C,
Exercise 3)
pois: POIs, stored as a dictionary of dictionaries
Task: For each user in users, determine which of their visits in checkins has a known POI
(meaning it appears in pois). The visit vector of that user will be those POIs.
Outputs: Return a Python dictionary of Python sets. The keys are user IDs, and the values are
the visit vectors.
Notes:
The output should only contain visit vectors for users who are in users and checkins.
Furthermore, the output should only include visits for POIs that are in pois.
Empty inputs and outputs are possible.
In Python