code: def test_hash_format(self):
      h = self.rbp.hash_vector(numpy.random.randn(100))
      self.assertEqual(len(h), 1)
      self.assertEqual(type(h[0]), type(""))
      self.assertEqual(len(h[0]), 10)
      for c in h[0]:
          self.assertTrue(c == "1" or c == "0")
  
imports: import numpy
  import scipy
  import unittest
  from nearpy.hashes import RandomBinaryProjections, RandomDiscretizedProjections, PCABinaryProjections, PCADiscretizedProjections
label_desc: Use image node_id 2 for calling the TestRandomBinaryProjections obj's underlying member method code with example usage: obj.test_hash_format() without return types