Update tools/ts_preprocess.py

tools/ts_preprocess.py

@@ -5,6 +5,7 @@ from typing import List
 
 MONTH = "MS"  # month-start frequency
 
+
 def _emi(principal: float, annual_rate: float, n_months: int) -> float:
     """
     EMI formula with monthly compounding.
@@ -19,6 +20,7 @@ def _emi(principal: float, annual_rate: float, n_months: int) -> float:
     fac = (1.0 + r) ** n_months
     return principal * r * fac / (fac - 1.0)
 
+
 def _project_deposit(principal: float, annual_rate: float, months: int) -> pd.DataFrame:
     """
     Monthly path for a deposit. Value compounds monthly.
@@ -31,6 +33,7 @@ def _project_deposit(principal: float, annual_rate: float, months: int) -> pd.Da
         bal = bal * (1.0 + r)
     return pd.DataFrame(data)
 
+
 def _project_asset(principal: float, annual_rate: float, tenor_months: int) -> pd.DataFrame:
     """
     Monthly amortization schedule for an asset/loan using EMI.
@@ -54,6 +57,7 @@ def _project_asset(principal: float, annual_rate: float, tenor_months: int) -> p
         bal = next_bal
     return pd.DataFrame(data)
 
+
 def build_timeseries(df: pd.DataFrame) -> pd.DataFrame:
     """
     Input df columns (example):