答案 0 :(得分：1)
如果您没有指定它们，Featuretools中的DFS会使用一组默认基元
默认聚合原语为['day', 'year', 'month', 'weekday', 'haversine', 'num_words', 'num_characters']
默认转换原语为Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x046E1780>
Traceback (most recent call last):
File "C:\Users\BS146\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\utils\autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
File "C:\Users\BS146\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\management\commands\runserver.py", line 112, in inner_run
autoreload.raise_last_exception()
File "C:\Users\BS146\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\utils\autoreload.py", line 248, in raise_last_exception
raise _exception[1]
File "C:\Users\BS146\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\management\__init__.py", line 327, in execute
autoreload.check_errors(django.setup)()
File "C:\Users\BS146\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\utils\autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
File "C:\Users\BS146\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\BS146\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\apps\registry.py", line 89, in populate
app_config = AppConfig.create(entry)
File "C:\Users\BS146\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\apps\config.py", line 90, in create
module = import_module(entry)
File "C:\Users\BS146\AppData\Local\Programs\Python\Python36-32\lib\importlib\__init__.py", line 117, in import_module
if name.startswith('.'):
AttributeError: module 'myapp' has no attribute 'startswith'
如果您为一个而不是另一个提供值，则使用默认列表。如果您不希望使用任何基元传递空列表。
您可以在Featuretools文档maximum item size in DynamoDB is 400 KB中找到此信息。