datetime_format_data_check¶

Data check that checks if the datetime column has equally spaced intervals and is monotonically increasing or decreasing in order to be supported by time series estimators.

Module Contents¶

Classes Summary¶

DateTimeFormatDataCheck

Check if the datetime column has equally spaced intervals and is monotonically increasing or decreasing in order to be supported by time series estimators.

Contents¶

class evalml.data_checks.datetime_format_data_check.DateTimeFormatDataCheck(datetime_column='index')[source]¶

Check if the datetime column has equally spaced intervals and is monotonically increasing or decreasing in order to be supported by time series estimators.

Parameters: datetime_column (str, int) – The name of the datetime column. If the datetime values are in the index, then pass “index”.

Methods

`name`	Return a name describing the data check.
`validate`	Checks if the target data has equal intervals and is sorted.

name(cls)¶: Return a name describing the data check.

validate(self, X, y)[source]¶

Checks if the target data has equal intervals and is sorted.

Parameters

X (pd.DataFrame, np.ndarray) – Features.
y (pd.Series, np.ndarray) – Target data.

Returns

List with DataCheckErrors if unequal intervals are found in the datetime column.

Return type

dict (DataCheckError)

Examples

>>> import pandas as pd
...
>>> X = pd.DataFrame(pd.date_range("2021-01-01", periods=9).append(pd.date_range("2021-01-31", periods=1)), columns=["dates"])
>>> y = pd.Series([0, 1, 0, 1, 1, 0, 0, 0, 1, 0])
>>> datetime_format_dc = DateTimeFormatDataCheck(datetime_column="dates")
>>> assert datetime_format_dc.validate(X, y) == {
...     "errors": [{"message": "No frequency could be detected in dates, possibly due to uneven intervals.",
...                 "data_check_name": "DateTimeFormatDataCheck",
...                 "level": "error",
...                 "code": "DATETIME_HAS_UNEVEN_INTERVALS",
...                 "details": {"columns": None, "rows": None}
...                 }],
...     "warnings": [],
...     "actions": []}
...
...
>>> X = pd.DataFrame([1, 2, 3, 4], columns=["Weeks"])
>>> y = pd.Series([0] * 4)
>>> datetime_format_dc = DateTimeFormatDataCheck(datetime_column="Weeks")
>>> assert datetime_format_dc.validate(X, y) == {
...     'warnings': [],
...     'errors': [{'message': 'Datetime information could not be found in the data, or was not in a supported datetime format.',
...                 'data_check_name': 'DateTimeFormatDataCheck',
...                 'level': 'error',
...                 'details': {'columns': None, 'rows': None},
...                 'code': 'DATETIME_INFORMATION_NOT_FOUND'}],
...     'actions': []}
...
...
>>> X = pd.DataFrame(pd.to_datetime([1, 2, 3, 4]), columns=["Weeks"])
>>> datetime_format_dc = DateTimeFormatDataCheck(datetime_column="Weeks")
>>> assert datetime_format_dc.validate(X, y) == {'warnings': [], 'errors': [], 'actions': []}
...
...
>>> X = pd.DataFrame(pd.date_range("2021-01-01", freq='W', periods=10), columns=["Weeks"])
>>> datetime_format_dc = DateTimeFormatDataCheck(datetime_column="Weeks")
>>> assert datetime_format_dc.validate(X, y) == {'warnings': [], 'errors': [], 'actions': []}
...
...
>>> X = X.iloc[::-1]
>>> datetime_format_dc = DateTimeFormatDataCheck(datetime_column="Weeks")
>>> assert datetime_format_dc.validate(X, y) == {
...     'warnings': [],
...     'errors': [{'message': 'Datetime values must be sorted in ascending order.',
...                 'data_check_name': 'DateTimeFormatDataCheck',
...                 'level': 'error',
...                 'details': {'columns': None, 'rows': None},
...                 'code': 'DATETIME_IS_NOT_MONOTONIC'}],
...     'actions': []}

data_checks

datetime_nan_data_check