add init-frz-model support for se-t type descriptor

[denghuilu]

Add init-frz-model support for set-t type descriptors.

lcurve.out shows that the compression training process of the se_t type has the same result as the original training process of the first step:

root se_e3 $ head compress.out 
#  step      rmse_val    rmse_trn    rmse_e_val  rmse_e_trn    rmse_f_val  rmse_f_trn         lr
      0      2.16e+01    1.86e+01      1.91e-02    1.30e-02      6.83e-01    5.89e-01    1.0e-03
     10      2.11e+01    2.23e+01      4.25e-01    4.27e-01      6.67e-01    7.06e-01    1.0e-03
     20      2.13e+01    2.16e+01      2.11e-02    2.04e-02      6.73e-01    6.84e-01    1.0e-03
     30      2.13e+01    2.17e+01      3.94e-02    3.30e-02      6.72e-01    6.88e-01    1.0e-03
     40      1.99e+01    2.23e+01      9.17e-02    8.79e-02      6.30e-01    7.05e-01    1.0e-03
     50      2.13e+01    2.05e+01      3.32e-02    2.76e-02      6.74e-01    6.49e-01    1.0e-03
     60      2.14e+01    2.35e+01      5.49e-03    9.87e-03      6.77e-01    7.42e-01    1.0e-03
     70      2.15e+01    1.89e+01      4.85e-02    5.44e-02      6.79e-01    5.96e-01    1.0e-03
     80      2.23e+01    2.08e+01      2.84e-02    3.15e-02      7.05e-01    6.58e-01    1.0e-03
root se_e3 $ head original.out 
#  step      rmse_val    rmse_trn    rmse_e_val  rmse_e_trn    rmse_f_val  rmse_f_trn         lr
      0      2.16e+01    1.86e+01      1.91e-02    1.30e-02      6.83e-01    5.89e-01    1.0e-03
     10      2.11e+01    2.23e+01      4.27e-01    4.28e-01      6.68e-01    7.06e-01    1.0e-03
     20      2.13e+01    2.16e+01      1.91e-02    1.84e-02      6.72e-01    6.84e-01    1.0e-03
     30      2.13e+01    2.17e+01      3.76e-02    3.12e-02      6.72e-01    6.88e-01    1.0e-03
     40      1.99e+01    2.23e+01      9.20e-02    8.82e-02      6.30e-01    7.05e-01    1.0e-03
     50      2.13e+01    2.05e+01      3.11e-02    2.55e-02      6.74e-01    6.49e-01    1.0e-03
     60      2.14e+01    2.34e+01      6.78e-03    1.12e-02      6.76e-01    7.41e-01    1.0e-03
     70      2.15e+01    1.88e+01      4.86e-02    5.44e-02      6.79e-01    5.96e-01    1.0e-03
     80      2.23e+01    2.08e+01      2.74e-02    3.05e-02      7.04e-01    6.58e-01    1.0e-03

[codecov-commenter]

Codecov Report

Merging #1245 (023fc6c) into devel (1a8fd73) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            devel    #1245   +/-   ##
=======================================
  Coverage   75.99%   75.99%           
=======================================
  Files          91       91           
  Lines        7389     7389           
=======================================
  Hits         5615     5615           
  Misses       1774     1774           

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