Numpy: libf77blas.so.3: no se puede abrir el archivo compartido: no existe tal archivo o directorio

-Sistema operativo: Raspbian Stretch (9)
-Cómo se instaló Python: Python 3.5.3 es Python3 predeterminado en Stretch
-Cómo se instaló numpy: pip instalado en un entorno virtual (versión 1.17.3)
-Python2.7 también está instalado por defecto

Quiero usar la biblioteca dldt de OpenVINO para hacer inferencias en raspberry pi 3. He tenido problemas antes, pero siguiendo algunas instrucciones aquí , construí la versión más reciente de la biblioteca usando cmake para la compilación nativa bajo raspbian stretch (tomó horas).

Primero noté el error al ejecutar su código de Python del optimizador de modelo:

$ python3 <dldt_dir>/model-optimizer/mo.py --input_model [input model] --data_type [data type] --output_dir [output_dir]
Traceback (most recent call last):
  File "/home/pi/.virtualenvs/openvino/lib/python3.5/site-packages/numpy/core/__init__.py", line 17, in <module>
    from . import multiarray
  File "/home/pi/.virtualenvs/openvino/lib/python3.5/site-packages/numpy/core/multiarray.py", line 14, in <module>
    from . import overrides
  File "/home/pi/.virtualenvs/openvino/lib/python3.5/site-packages/numpy/core/overrides.py", line 7, in <module>
    from numpy.core._multiarray_umath import (
ImportError: libf77blas.so.3: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pi/.virtualenvs/openvino/lib/python3.5/site-packages/numpy/__init__.py", line 142, in <module>
    from . import core
  File "/home/pi/.virtualenvs/openvino/lib/python3.5/site-packages/numpy/core/__init__.py", line 47, in <module>
    raise ImportError(msg)
ImportError: 

IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!

Importing the numpy c-extensions failed.
- Try uninstalling and reinstalling numpy.
- If you have already done that, then:
  1. Check that you expected to use Python3.5 from "/home/pi/.virtualenvs/openvino/bin/python",
     and that you have no directories in your PATH or PYTHONPATH that can
     interfere with the Python and numpy version "1.17.3" you're trying to use.
  2. If (1) looks fine, you can open a new issue at
     https://github.com/numpy/numpy/issues.  Please include details on:
     - how you installed Python
     - how you installed numpy
     - your operating system
     - whether or not you have multiple versions of Python installed
     - if you built from source, your compiler versions and ideally a build log

- If you're working with a numpy git repository, try `git clean -xdf`
  (removes all files not under version control) and rebuild numpy.

Note: this error has many possible causes, so please don't comment on
an existing issue about this - open a new one instead.

Original error was: libf77blas.so.3: cannot open shared object file: No such file or directory

Sin embargo, descubrí rápidamente que este problema persiste al importar numpy desde Python3

>>> import numpy as np
[...]
Importing the numpy c-extensions failed.
[...]
Original error was: libf77blas.so.3: cannot open shared object file: No such file or directory

Intenté desinstalar y reinstalar numpy. Me aseguré de que numpy funcionara en Python3 antes de instalar la biblioteca dldt.
Por favor ayuda. Tu eres mi única esperanza.