Add softmax opeartor

[Ziminli]

pytest output:

=================================================================================== test session starts ===================================================================================
platform linux -- Python 3.10.12, pytest-8.3.5, pluggy-1.5.0
rootdir: /data6/lizimin/ntops
configfile: pyproject.toml
collected 70 items                                                                                                                                                                        

tests/test_abs.py ........                                                                                                                                                          [ 11%]
tests/test_add.py ........                                                                                                                                                          [ 22%]
tests/test_addmm.py ..                                                                                                                                                              [ 25%]
tests/test_bmm.py ..                                                                                                                                                                [ 28%]
tests/test_div.py ........                                                                                                                                                          [ 40%]
tests/test_exp.py ........                                                                                                                                                          [ 51%]
tests/test_gelu.py ........                                                                                                                                                         [ 62%]
tests/test_mm.py ..                                                                                                                                                                 [ 65%]
tests/test_mul.py ........                                                                                                                                                          [ 77%]
tests/test_rsqrt.py ........                                                                                                                                                        [ 88%]
tests/test_softmax.py ........                                                                                                                                                      [100%]

============================================================================= 70 passed in 105.73s (0:01:45) ==============================================================================

[voltjia]

pytest output:

============================= test session starts ==============================
platform linux -- Python 3.10.12, pytest-8.3.3, pluggy-1.5.0
rootdir: /home/huangjiacheng/ntops
configfile: pyproject.toml
plugins: cov-6.0.0
collected 174 items

tests/test_abs.py ........                                               [  4%]
tests/test_add.py ........                                               [  9%]
tests/test_addmm.py ..                                                   [ 10%]
tests/test_bmm.py ..                                                     [ 11%]
tests/test_cos.py ........                                               [ 16%]
tests/test_div.py ........                                               [ 20%]
tests/test_eq.py ........                                                [ 25%]
tests/test_exp.py ........                                               [ 29%]
tests/test_ge.py ........                                                [ 34%]
tests/test_gelu.py ........                                              [ 39%]
tests/test_gt.py ........                                                [ 43%]
tests/test_isinf.py ........                                             [ 48%]
tests/test_isnan.py ........                                             [ 52%]
tests/test_le.py ........                                                [ 57%]
tests/test_lt.py ........                                                [ 62%]
tests/test_mm.py ..                                                      [ 63%]
tests/test_mul.py ........                                               [ 67%]
tests/test_ne.py ........                                                [ 72%]
tests/test_relu.py ........                                              [ 77%]
tests/test_rsqrt.py ........                                             [ 81%]
tests/test_sigmoid.py ........                                           [ 86%]
tests/test_sin.py ........                                               [ 90%]
tests/test_softmax.py ........                                           [ 95%]
tests/test_tanh.py ........                                              [100%]

======================= 174 passed in 294.34s (0:04:54) ========================