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65 lines
1.8 KiB
Python
65 lines
1.8 KiB
Python
# Copyright (c) Microsoft Corporation.
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# Licensed under the MIT License.
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import unittest
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import numpy as np
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from qlib.data import D
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from qlib.data.ops import ElemOperator, PairOperator
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from qlib.tests import TestAutoData
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class Diff(ElemOperator):
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"""Feature First Difference
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Parameters
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----------
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feature : Expression
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feature instance
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Returns
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----------
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Expression
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a feature instance with first difference
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"""
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def _load_internal(self, instrument, start_index, end_index, freq):
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series = self.feature.load(instrument, start_index, end_index, freq)
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return series.diff()
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def get_extended_window_size(self):
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lft_etd, rght_etd = self.feature.get_extended_window_size()
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return lft_etd + 1, rght_etd
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class Distance(PairOperator):
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"""Feature Distance
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Parameters
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----------
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feature : Expression
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feature instance
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Returns
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----------
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Expression
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a feature instance with distance
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"""
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def _load_internal(self, instrument, start_index, end_index, freq):
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series_left = self.feature_left.load(instrument, start_index, end_index, freq)
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series_right = self.feature_right.load(instrument, start_index, end_index, freq)
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return np.abs(series_left - series_right)
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class TestRegiterCustomOps(TestAutoData):
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@classmethod
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def setUpClass(cls) -> None:
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cls._setup_kwargs.update({"custom_ops": [Diff, Distance]})
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super().setUpClass()
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def test_regiter_custom_ops(self):
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instruments = ["SH600000"]
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fields = ["Diff($close)", "Distance($close, Ref($close, 1))"]
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print(D.features(instruments, fields, start_time="2010-01-01", end_time="2017-12-31", freq="day"))
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if __name__ == "__main__":
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unittest.main()
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