nd4j-common/src/main/java/org/nd4j/util/StringUtils.java
public static String format(final String format, final Object... objects) {
        return String.format(Locale.ENGLISH, format, objects);
    }
public static String format(final String format, final Object... objects) {
        return String.format(Locale.ENGLISH, format, objects);
    }
The same as String.format(Locale.ENGLISH, format, objects).