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Replace nan in log view output with n/a (not available)

Junchao Zhang requested to merge jczhang/2024-03-19/improve-nan-log-view into main

A sample of the new output. I could also use -/-, but I feel n/a is more meaningful.

Event                Count      Time (sec)     Flop                              --- Global ---  --- Stage ----  Total   GPU    - CpuToGpu -   - GpuToCpu - GPU
                   Max Ratio  Max     Ratio   Max  Ratio  Mess   AvgLen  Reduct  %T %F %M %L %R  %T %F %M %L %R Mflop/s Mflop/s Count   Size   Count   Size  %F
---------------------------------------------------------------------------------------------------------------------------------------------------------------

--- Event Stage 0: Main Stage

BuildTwoSided          2 1.0  n/a     n/a   0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   0  0  0  0  0  n/a    n/a       0 0.00e+00    0 0.00e+00  0
MatMult               74 1.0  n/a     n/a   1.47e+05 1.0 0.0e+00 0.0e+00 0.0e+00  0 34  0  0  0   0 34  0  0  0  n/a    n/a       1 1.26e-02    0 0.00e+00  100
MatMultAdd            18 1.0  n/a     n/a   1.67e+04 1.0 0.0e+00 0.0e+00 0.0e+00  0  4  0  0  0   0  4  0  0  0  n/a    n/a       0 0.00e+00    0 0.00e+00  100
MatMultTranspose      18 1.0  n/a     n/a   1.56e+04 1.0 0.0e+00 0.0e+00 0.0e+00  0  4  0  0  0   0  4  0  0  0  n/a    n/a       0 0.00e+00    0 0.00e+00  100
MatSolve              18 1.0  n/a     n/a   4.97e+03 1.0 0.0e+00 0.0e+00 0.0e+00  0  1  0  0  0   0  1  0  0  0  n/a    n/a       0 0.00e+00    0 0.00e+00  100

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