В чем разница между numpy.linalg.lstsq и scipy.linalg.lstsq?

public static final String  UPPER_CAMEL = "initUp";
public static final String  LOWER_CAMEL = "initLow";

public String toCamel(String src, String separator, String format) {
    StringBuilder builder = new StringBuilder(src.toLowerCase());
    int len = builder.length();

    for (int idx = builder.indexOf(separator); idx > 0 && idx < len; idx = builder.indexOf(separator, idx)) {
        builder = builder.replace(idx, idx + 2, (String.valueOf(builder.charAt(idx + 1)).toUpperCase()));
    }

    switch (format) {
    case LOWER_CAMEL:
        builder.setCharAt(0, Character.toLowerCase(builder.charAt(0)));
        break;
    default:
        builder.setCharAt(0, Character.toUpperCase(builder.charAt(0)));
        break;
    }

    return builder.toString();

}

Вызов как

toCamel("THIS_IS_AN_EXAMPLE_STRING", "_", UPPER_CAMEL)

Время выполнения: 14 мс