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undefined symbol: sgemm_ when importing IPEX

See original GitHub issue

I build pytorch and IPEX according to the README in Ubuntu 20.04

Everything is find until I execute import intel_pytorch_extension as ipex.

Error reported:

ImportError                               Traceback (most recent call last)
<ipython-input-3-1031a6c8b3e2> in <module>
----> 1 import intel_pytorch_extension as ipex

~/.pyenv/versions/pytorch/lib/python3.7/site-packages/torch_ipex-1.0.0-py3.7-linux-x86_64.egg/intel_pytorch_extension/__init__.py in <module>
      5 from .version import __version__
      6 from .tensor import *
----> 7 from .optim import *
      8 from .ops import *
      9 import _torch_ipex as core

~/.pyenv/versions/pytorch/lib/python3.7/site-packages/torch_ipex-1.0.0-py3.7-linux-x86_64.egg/intel_pytorch_extension/optim/__init__.py in <module>
----> 1 from .split_sgd import is_available
      2 from .split_sgd import SplitSGD

~/.pyenv/versions/pytorch/lib/python3.7/site-packages/torch_ipex-1.0.0-py3.7-linux-x86_64.egg/intel_pytorch_extension/optim/split_sgd.py in <module>
      1 import torch
      2 from torch.optim.optimizer import Optimizer, required
----> 3 import _torch_ipex
      4
      5 _available = False

ImportError: /home/user/.pyenv/versions/pytorch/lib/python3.7/site-packages/torch_ipex-1.0.0-py3.7-linux-x86_64.egg/_torch_ipex.cpython-37m-x86_64-linux-gnu.so: undefined symbol: sgemm_

It can barely find any thing about sgemm__ symbol in Google. What happened here?