add method == true in base.py

src/mrinufft/operators/base.py

@@ -334,20 +334,24 @@ def compute_density(self, method=None):
 
         Parameters
         ----------
-        method: str or callable or array or dict
+        method: str or callable or array or dict or bool
             The method to use to compute the density compensation.
             If a string, the method should be registered in the density registry.
             If a callable, it should take the samples and the shape as input.
             If a dict, it should have a key 'name', to determine which method to use.
             other items will be used as kwargs.
             If an array, it should be of shape (Nsamples,) and will be used as is.
+            If `True`, the method `pipe` is chosen as default estimation method,
+            if `backend` is `tensorflow`, `gpunufft` or `torchkbnufft`
         """
         if isinstance(method, np.ndarray):
             self.density = method
             return None
         if not method:
             self.density = None
             return None
+        if method is True:
+            method = "pipe"
 
         kwargs = {}
         if isinstance(method, dict):