#!/usr/bin/env python
# coding: utf-8

# In[1]:


import numpy as np
import theano.tensor as tt
import pymc3 as pm


# In[5]:


with pm.Model() as model:
    
    β = pm.Normal('β', 0.5, sd=1000, shape=2)
    
    # Initialize a tensor of zeros, and replace all but one with the variables
    betas = tt.set_subtensor(tt.zeros(shape=3)[1:], β)
    


# In[6]:


betas.tag.test_value