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Calling a function within a class with pool.map with one argument and self: TypeError: map() missing 1 required positional argument: 'iterable'

I'm trying to call a function within a class from another function within the same class with pool map

pool = Pool(num_cores)
res = pool.map(self.get_data_vector())
The function has no arguments except self and I'm getting this error
TypeError: map() missing 1 required positional argument: 'iterable'
This is the function
def get_data_vector(self):
EDIT:
I was missing the variable to map which is self.doc_ids and it is a list. 
I'm now calling it like this
res = pool.map(__class__.get_data_vector,(self,self.doc_ids))
The function should be called like this
def get_data_vector(self, doc_id):
but the error now changed to
TypeError: get_data_vector() missing 1 required positional argument: 'doc_id'
                then this is not a case for a map, a map converts an iterable to a new iterable where it applies a function on every element.
– Willem Van Onsem
                Oct 5, 2018 at 19:09
I will assume that self.doc_ids is a list or something else iterable.
Then you should be able to use this:
res = pool.map(self.get_data_vector, self.doc_ids)
This means that get_data_vector will be called with two arguments.  The first one is self, as a bound method, and the second one are the elements of the iterable self.doc_ids.
        
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