Fix the frequency for DeepAR PandasDataset #153
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What is the PR fixing?
AutoML couldn't register DeepAR models for some multi-series dataset, because the sample input may only contain 1 unique timestamp, where
PandasDatasetwould fail to instantiate because ofinfer_freqfailure.This PR explicitly specifies the frequency.
How is it tested?
Manual testing: use the AutoML runtime wheel in the AutoML library, and test a multi-series dataset in E2 dogfood