Add neg operator

[stever178]

pytest output:

=============================== test session starts ================================
platform linux -- Python 3.12.5, pytest-8.3.5, pluggy-1.5.0
rootdir: /home/lsj/projects/ntops
configfile: pyproject.toml
plugins: cov-6.1.1
collected 102 items

tests/test_abs.py ........                                                   [  7%]
tests/test_add.py ........                                                   [ 15%]
tests/test_addmm.py ..                                                       [ 17%]
tests/test_bmm.py ..                                                         [ 19%]
tests/test_cos.py ........                                                   [ 27%]
tests/test_div.py ........                                                   [ 35%]
tests/test_exp.py ........                                                   [ 43%]
tests/test_gelu.py ........                                                  [ 50%]
tests/test_mm.py ..                                                          [ 52%]
tests/test_mul.py ........                                                   [ 60%]
tests/test_neg.py ........                                                   [ 68%]
tests/test_relu.py ........                                                  [ 76%]
tests/test_rsqrt.py ........                                                 [ 84%]
tests/test_sigmoid.py ........                                               [ 92%]
tests/test_sin.py ........                                                   [100%]

========================== 102 passed in 98.57s (0:01:38) ==========================

[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_neg.py ........                                               [ 77%]
tests/test_relu.py ........                                              [ 81%]
tests/test_rsqrt.py ........                                             [ 86%]
tests/test_sigmoid.py ........                                           [ 90%]
tests/test_sin.py ........                                               [ 95%]
tests/test_tanh.py ........                                              [100%]

======================= 174 passed in 503.78s (0:08:23) ========================