Hi,

Since the v1.1b0 I can't use a pulled distribution. For example I can't compute the grad_log_x of a pulled distribution as in the test code below. I use python 3.6.1.

Best regards,

Paul.

```
import logging
import warnings
import numpy as np
import scipy.stats as stats
import TransportMaps as TM
import TransportMaps.Maps as MAPS
warnings.simplefilter("ignore")
TM.setLogLevel(logging.INFO)
import TransportMaps.Distributions as DIST
class GumbelDistribution(DIST.Distribution):
def __init__(self, mu, beta):
super(GumbelDistribution,self).__init__(1)
self.mu = mu
self.beta = beta
self.dist = stats.gumbel_r(loc=mu, scale=beta)
def pdf(self, x, params=None):
return self.dist.pdf(x).flatten()
def log_pdf(self, x, params=None):
return self.dist.logpdf(x).flatten()
def grad_x_log_pdf(self, x, params=None):
m = self.mu
b = self.beta
z = (x-m)/b
return (np.exp(-z)-1.)/b
def hess_x_log_pdf(self, x, params=None):
m = self.mu
b = self.beta
z = (x-m)/b
return (-np.exp(-z)/b**2.)[:,:,np.newaxis]
mu = -63.
beta = 3.
pi = GumbelDistribution(mu,beta)
x=np.linspace(0,10,100)[:,np.newaxis]
mu = np.array([-60])
sigma = np.array([[8]])
# Linear map
L = MAPS.LinearTransportMap(mu, sigma)
pull_L_pi = DIST.PullBackTransportMapDistribution(L,pi)
pull_L_pi.grad_x_log_pdf(x)
```

`best,

paul.