def remove_external_data_field(tensor, field_key):
    """
    Remove a field from a Tensor's external_data key-value store.

    Modifies tensor object in place.

    @params
    tensor: Tensor object from which value will be removed
    field_key: The key of the field to be removed
    """
    for i, field in enumerate(tensor.external_data):
        if field.key == field_key:
            del tensor.external_data[i]
