TypeError: data type "float128" not understood

[karnn]

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Import pymc3 fails on windows and anaconda with TypeError numpy.float128 datatype not recognised

Python 3.8.2 numpy 1.18.4

import pymc3

Error log:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-1-75554ce6e5eb> in <module>
      2 import matplotlib.pyplot as plt
      3 import numpy as np
----> 4 import pymc3 as pm
      5 import scipy.stats as stats

~\Miniconda3\envs\stat-rethink2-pymc3\lib\site-packages\pymc3\__init__.py in <module>
     49 
     50 from .blocking import *
---> 51 from .distributions import *
     52 from .distributions import transforms
     53 from .glm import *

~\Miniconda3\envs\stat-rethink2-pymc3\lib\site-packages\pymc3\distributions\__init__.py in <module>
     13 #   limitations under the License.
     14 
---> 15 from . import timeseries
     16 from . import transforms
     17 from . import shape_utils

~\Miniconda3\envs\stat-rethink2-pymc3\lib\site-packages\pymc3\distributions\timeseries.py in <module>
     20 
     21 from pymc3.util import get_variable_name
---> 22 from .continuous import get_tau_sigma, Normal, Flat
     23 from .shape_utils import to_tuple
     24 from . import multivariate

~\Miniconda3\envs\stat-rethink2-pymc3\lib\site-packages\pymc3\distributions\continuous.py in <module>
     30 from .special import log_i0
     31 from ..math import invlogit, logit, logdiffexp
---> 32 from .dist_math import (
     33     alltrue_elemwise, betaln, bound, gammaln, i0e, incomplete_beta, logpow,
     34     normal_lccdf, normal_lcdf, SplineWrapper, std_cdf, zvalue,

~\Miniconda3\envs\stat-rethink2-pymc3\lib\site-packages\pymc3\distributions\dist_math.py in <module>
     35 f = floatX
     36 c = - .5 * np.log(2. * np.pi)
---> 37 _beta_clip_values = {
     38     dtype: (np.nextafter(0, 1, dtype=dtype), np.nextafter(1, 0, dtype=dtype))
     39     for dtype in ["float16", "float32", "float64", "float128"]

~\Miniconda3\envs\stat-rethink2-pymc3\lib\site-packages\pymc3\distributions\dist_math.py in <dictcomp>(.0)
     36 c = - .5 * np.log(2. * np.pi)
     37 _beta_clip_values = {
---> 38     dtype: (np.nextafter(0, 1, dtype=dtype), np.nextafter(1, 0, dtype=dtype))
     39     for dtype in ["float16", "float32", "float64", "float128"]
     40 }

TypeError: data type "float128" not understood

Please provide any additional information below.

Versions and main components

• PyMC3 Version: 3.8
• Theano Version:1.0.4
• Python Version:3.8.2
• Operating system: windows 10
• How did you install PyMC3: (conda/pip) conda

[lucianopaz]

Original issue was posted on pymc resources