<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def validate(self, instance, value):
 """Check shape and dtype of vector and scales it to given length"""


        value = super(BaseVector, self).validate(instance, value)

        if self.length is not None:
            try:
                value.length = self._length_array(value)
            except ZeroDivisionError:
                self.error(
                    instance, value,
                    error_class=ZeroDivValidationError,
                    extra='The vector must have a length specified.'
                )
        return value