Fix misleading error when feature names are missing during inference (#10814)
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@ -3129,7 +3129,7 @@ class Booster:
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if feature_names is None and self.feature_names is not None:
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if feature_names is None and self.feature_names is not None:
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raise ValueError(
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raise ValueError(
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"training data did not have the following fields: "
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"data did not contain feature names, but the following fields are expected: "
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+ ", ".join(self.feature_names)
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+ ", ".join(self.feature_names)
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)
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)
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