Dear all, just a very small question:

The following code gives an arror `AttributeError: 'numpy.dtype' object has no attribute 'base_dtype'`

, but because I am new in TF, I am not sure about the mistake. Maybe you could point it out fast.

```
t = np.array(np.arange(1,13,1),dtype='int64')
@pm.model
def lt_model():
Δ = yield pm.Laplace(loc=0, scale=4, batch_stack=5, name='Δ')
g = tf.math.scalar_mul(Δ,t)
trace = pm.inference.sampling.sample(
lt_model(), num_chains=2, num_samples=10, burn_in=10, step_size=1., xla=True)
```

as I understood the shape parameter is now given by `batch_stack`

(or by `plate`

)?

Thank you in advance