sample_prior_predictive() sample parameter fails on tuple (models with deterministics and symbolic tensors?)

[gbernstein6]

Description of your problem

sample_prior_predictive() sample parameter fails on tuple (models with deterministics and symbolic tensors?) as per discussion from @lucianopaz here

Please provide a minimal, self-contained, and reproducible example.

import pymc3 as pm

with pm.Model():
    var = pm.distributions.continuous.InverseGamma('var', alpha=1, beta=1)
    pm.distributions.continuous.Normal('x', mu=0, sd=pm.math.sqrt(var))

    print(pm.sample_prior_predictive(samples=(1,10)))

Please provide the full traceback.

  File "//anaconda3/lib/python3.7/site-packages/pymc3/sampling.py", line 1325, in sample_prior_predictive
    values = draw_values([model[name] for name in names], size=samples)
  File "//anaconda3/lib/python3.7/site-packages/pymc3/distributions/distribution.py", line 369, in draw_values
    size=size)
  File "//anaconda3/lib/python3.7/site-packages/pymc3/distributions/distribution.py", line 463, in _draw_value
    return param.random(point=point, size=size)
  File "//anaconda3/lib/python3.7/site-packages/pymc3/model.py", line 43, in __call__
    return getattr(self.obj, self.method_name)(*args, **kwargs)
  File "//anaconda3/lib/python3.7/site-packages/pymc3/distributions/continuous.py", line 457, in random
    point=point, size=size)
  File "//anaconda3/lib/python3.7/site-packages/pymc3/distributions/distribution.py", line 400, in draw_values
    size=size)
  File "//anaconda3/lib/python3.7/site-packages/pymc3/distributions/distribution.py", line 508, in _draw_value
    output = np.array([func(*v) for v in zip(*values)])
  File "//anaconda3/lib/python3.7/site-packages/pymc3/distributions/distribution.py", line 508, in <listcomp>
    output = np.array([func(*v) for v in zip(*values)])
  File "//anaconda3/lib/python3.7/site-packages/theano/compile/function_module.py", line 813, in __call__
    allow_downcast=s.allow_downcast)
  File "//anaconda3/lib/python3.7/site-packages/theano/tensor/type.py", line 178, in filter
    data.shape))
TypeError: Bad input argument to theano function with name "//anaconda3/lib/python3.7/site-packages/pymc3/distributions/distribution.py:431" at index 0 (0-based). Wrong number of dimensions: expected 0, got 1 with shape (10,).

Versions and main components

• PyMC3 Version: 3.6
• Theano Version: 1.0.3
• Python Version: 3.7.1
• Operating system: Mac OSX 10.13.6
• How did you install PyMC3: conda

[lucianopaz]

Closed via #3456