raise value error with duplicate backend target

dboyliao · dboyliao · commit 9c8cc412ebee · 2020-05-27T12:29:48.000+08:00
diff --git a/utensor_cgen/backend/api.py b/utensor_cgen/backend/api.py
@@ -19,6 +19,8 @@ def register(cls, backend_cls):
       raise TypeError(
         'can only register subclass of %s: get %s' % (Backend, backend_cls)
       )
+    if backend_cls.TARGET in cls.BACKENDS:
+      raise ValueError('duplicate TARGET detected: %s' % backend_cls.TARGET)
     cls.BACKENDS[backend_cls.TARGET] = backend_cls
     return backend_cls
 

Original file line number	Diff line number	Diff line change
`@@ -19,6 +19,8 @@ def register(cls, backend_cls):`
`19`	`19`	`raise TypeError(`
`20`	`20`	`'can only register subclass of %s: get %s' % (Backend, backend_cls)`
`21`	`21`	`)`
	`22`	`+ if backend_cls.TARGET in cls.BACKENDS:`
	`23`	`+ raise ValueError('duplicate TARGET detected: %s' % backend_cls.TARGET)`
`22`	`24`	`cls.BACKENDS[backend_cls.TARGET] = backend_cls`
`23`	`25`	`return backend_cls`
`24`	`26`