add dcnv3 src code ande update readme file

detection/ops_dcnv3/functions/__init__.py

@@ -5,3 +5,4 @@
 # --------------------------------------------------------
 
 from .dcnv3_func import DCNv3Function, dcnv3_core_pytorch
+__version__ = '0.1'

detection/ops_dcnv3/test.py

@@ -52,8 +52,13 @@ def check_forward_equal_with_pytorch_double():
 
     fwdok = torch.allclose(output_cuda, output_pytorch)
     max_abs_err = (output_cuda - output_pytorch).abs().max()
-    max_rel_err = ((output_cuda - output_pytorch).abs() /
-                   output_pytorch.abs()).max()
+    #max_rel_err = ((output_cuda - output_pytorch).abs() /
+    #               output_pytorch.abs()).max()
+    non_zero_mask = output_pytorch.abs() > 0
+    if non_zero_mask.any():
+        max_rel_err = ((output_cuda[non_zero_mask] - output_pytorch[non_zero_mask]).abs() / output_pytorch[non_zero_mask].abs()).max()
+    else:
+        max_rel_err = 0.0  # 如果所有值都为零，则相对误差为 0
     print('>>> forward double')
     print(f'* {fwdok} check_forward_equal_with_pytorch_double: max_abs_err {max_abs_err:.2e} max_rel_err {max_rel_err:.2e}')