Assertion: feature | /r/HasProperty | useful
Facets:
value: to let
type: PURPOSE
value: in real world programs
type: LOCATION
value: immediately
type: MANNER
value: for the study of diseases
type: PURPOSE
Source sentences:
text: Higher-level features can be obtained from already available features and added to the feature vector; for example, for the study of diseases the feature 'Age' is useful and is defined as Age = 'Year of death' minus 'Year of birth' .
text: It must be driven by actual problems and its features should be immediately useful in real world programs.
text: The prefix  indicates that the list of elements following it on the same line starts with the first element of the vector (a feature that is useful when the output extends over multiple lines).
text: The feature may be useful if Microsoft manages to suggest the correct site URL.
text: Facebook staff also said the feature will be useful not only to let friends know where they are, but also to learn if their friends are nearby at the same time, and to write down what they are doing at the location and what they think about it -- creating a trail allowing friends to see what the writer did there days or even years ago.
text: Warehouse management: This feature is useful if you need to optimize your warehouse stock and maintain an accurate log of each product’s location.