Source code for gluonts.time_feature.seasonality
# Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# or in the "license" file accompanying this file. This file is distributed
# on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
# express or implied. See the License for the specific language governing
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import logging
import pandas as pd
from gluonts.time_feature import norm_freq_str
logger = logging.getLogger(__name__)
DEFAULT_SEASONALITIES = {
"S": 3600, # 1 hour
"s": 3600, # 1 hour
"T": 1440, # 1 day
"min": 1440, # 1 day
"H": 24, # 1 day
"h": 24, # 1 day
"D": 1, # 1 day
"W": 1, # 1 week
"M": 12,
"ME": 12,
"B": 5,
"Q": 4,
"QE": 4,
}
[docs]def get_seasonality(freq: str, seasonalities=DEFAULT_SEASONALITIES) -> int:
"""
Return the seasonality of a given frequency:
>>> get_seasonality("2h")
12
"""
offset = pd.tseries.frequencies.to_offset(freq)
base_seasonality = seasonalities.get(norm_freq_str(offset.name), 1)
seasonality, remainder = divmod(base_seasonality, offset.n)
if not remainder:
return seasonality
logger.warning(
f"Multiple {offset.n} does not divide base seasonality "
f"{base_seasonality}. Falling back to seasonality 1."
)
return 1