Source Code for Module geometry.manifolds.todo.stiefel

 1  from . import contract 
 2   
 3   
 4 -def NonCompactStiefel(DifferentiableManifold): 
 5      ''' INCOMPLETE -- Matrices of fixed rank. ''' 
 6   
 7      @contract(n='N,N>0', p='P,P>0,P<=N') 
 8      def __init__(self, p, n): 
 9          '''  
10              Initializes the manifold structure.  
11               
12              :param n: dimension of space 
13              :param p: rank of subspace 
14          ''' 
15          DifferentiableManifold.__init_(self) 
16          self.n = n 
17          self.p = p 
18   
19      def belongs(self, a): 
20          assert False 
21   
22      def distance(self, a, b): 
23          assert False 
24   
25      def logmap(self, a, b): 
26          assert False 
27   
28      def expmap(self, a, vel): 
29          assert False 
30   
31      def project_ts(self, base, vx): 
32          assert False 
33   
34      def sample_uniform(self): 
35          assert False 
36   
37      def normalize(self, x): 
38          assert False 
39