def testCompareToZscore(self):
"""Test by comparing to results of elderly z-score function
"""
for ds in self.dss:
ds1 = deepcopy(ds)
ds2 = deepcopy(ds)
zsm = ZScoreMapper()
zsm.train(ds1)
ds1z = zsm.forward(ds1.samples)
zscore(ds2, perchunk=False)
self.failUnless(N.linalg.norm(ds1z - ds2.samples) < 1e-12)
self.failUnless((ds1.samples == ds.samples).all(),
msg="It seems we modified original dataset!")
ds0 = zsm.reverse(ds1z)
self.failUnless(N.linalg.norm(ds0 - ds.samples) < 1e-12,
msg="Can't reconstruct from z-scores")
