Following the example:

http://edwardlib.org/tutorials/supervised-classification

I get an error about cholesky decomposition being unsuccessful, however if I do the below:

```
import edward as ed
from edward.models import Bernoulli, Normal, MultivariateNormalTriL
from sklearn.metrics.pairwise import rbf_kernel
X = tf.placeholder(tf.float32, [N, P])
chol_X = tf.placeholder(tf.float32, [N, N])
cov_mat = rbf_kernel(data)
chol_cov_mat = np.linalg.cholesky(cov_mat)
f = MultivariateNormalTriL(
loc=tf.zeros(N),
scale_tril=chol_X
)
y = Bernoulli(logits=f)
qf = Normal(loc=tf.get_variable("qf/loc", [N]),
scale=tf.nn.softplus(tf.get_variable("qf/scale", [N]))
)
infer = ed.KLqp({f: qf}, data={X:data, y:response, chol_X:chol_cov_mat})
infer.run(n_iter=500)
```

it runs without error. I’m really unsure as to what is happening here ?

perhaps this may be a question for tensorflow people since it seems it’s the tf.cholesky that gives an error and not np.linalg.cholesky, or perhaps the rbf kernel I’m using from sklearn is different from ed.rbf?

going a bit further:

```
import tensorflow as tf
from edward.utils import rbf
from sklearn.metrics.pairwise import rbf_kernel
tf.enable_eager_execution()
# loading data is done
k1 = rbf(data).numpy()
k2 = rbf_kernel(data)
# the two matrices above are not the same
np.linalg.cholesky(k1) # fails to run
np.linalg.cholesky(k2) # runs
tf.cholesky(k1) # fails to run
tf.cholesky(k2) # runs
```