New translations Problems.md (Chinese Simplified)

lang/zh/Problems.md

@@ -0,0 +1,23 @@
+# About graph kenrels.
+
+## (Random walk) Sylvester equation kernel.
+
+### ImportError: cannot import name 'frange' from 'matplotlib.mlab'
+
+You are using an outdated `control` with a recent `matplotlib`. `mlab.frange` was removed in `matplotlib-3.1.0`, and `control` removed the call in `control-0.8.2`.
+
+Update your `control` package.
+
+### Intel MKL FATAL ERROR: Cannot load libmkl_avx2.so or libmkl_def.so.
+
+The Intel Math Kernel Library (MKL) is missing or not properly set. I assume MKL is required by the `control` module.
+
+Install MKL. Then add the following to your path:
+
+```
+export PATH=/opt/intel/bin:$PATH
+
+export LD_LIBRARY_PATH=/opt/intel/lib/intel64:/opt/intel/mkl/lib/intel64:$LD_LIBRARY_PATH
+
+export LD_PRELOAD=/opt/intel/mkl/lib/intel64/libmkl_def.so:/opt/intel/mkl/lib/intel64/libmkl_avx2.so:/opt/intel/mkl/lib/intel64/libmkl_core.so:/opt/intel/mkl/lib/intel64/libmkl_intel_lp64.so:/opt/intel/mkl/lib/intel64/libmkl_intel_thread.so:/opt/intel/lib/intel64_lin/libiomp5.so
+```