Merge pull request #443 from aai-institute/fix/value-init

Fix data_names in ValuationResult.zeros()

Author: mdbenito

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Fix initialization of `data_names` in `ValuationResult.zeros()`
+  [PR #443](https://github.com/aai-institute/pyDVL/pull/443)
 - Using pytest-xdist for faster local tests
   [PR #440](https://github.com/aai-institute/pyDVL/pull/440)
 - Added `AntitheticPermutationSampler`

src/pydvl/reporting/plots.py

@@ -104,7 +104,7 @@ def plot_ci_array(
     means = np.mean(data, axis=0)
     variances = np.var(data, axis=0, ddof=1)
 
-    dummy: ValuationResult[np.int_, str] = ValuationResult(
+    dummy: ValuationResult[np.int_, np.object_] = ValuationResult(
         algorithm="dummy",
         values=means,
         variances=variances,

src/pydvl/value/result.py

@@ -784,13 +784,17 @@ def zeros(
             indices = np.arange(n_samples, dtype=np.int_)
         else:
             indices = np.array(indices, dtype=np.int_)
+
+        if data_names is None:
+            data_names = np.array(indices)
+        else:
+            data_names = np.array(data_names)
+
         return cls(
             algorithm=algorithm,
             status=Status.Pending,
             indices=indices,
-            data_names=np.array(data_names, dtype=object)
-            if data_names is not None
-            else np.empty_like(indices, dtype=object),
+            data_names=data_names,
             values=np.zeros(len(indices)),
             variances=np.zeros(len(indices)),
             counts=np.zeros(len(indices), dtype=np.int_),