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''' |
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Utilities and auxiliary functions. |
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:author: Andreas Kanz |
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''' |
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# Imports |
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import numpy as np |
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import pandas as pd |
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def _corr_selector(corr, split=None, threshold=0): |
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''' |
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Parameters |
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---------- |
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corr: List or matrix of correlations. |
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split: {None, 'pos', 'neg', 'high', 'low'}, default None |
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Type of split to be performed. |
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threshold: float, default 0 |
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Value between 0 <= threshold <= 1 |
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Returns: |
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------- |
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corr: List or matrix of (filtered) correlations. |
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''' |
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if split == 'pos': |
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corr = corr.where((corr >= threshold) & (corr > 0)) |
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print('Displaying positive correlations. Use "threshold" to further limit the results.') |
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elif split == 'neg': |
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corr = corr.where((corr <= threshold) & (corr < 0)) |
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print('Displaying negative correlations. Use "threshold" to further limit the results.') |
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elif split == 'high': |
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corr = corr.where(np.abs(corr) >= threshold) |
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print('Displaying absolute correlations above a chosen threshold.') |
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elif split == 'low': |
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corr = corr.where(np.abs(corr) <= threshold) |
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print('Displaying absolute correlations below a chosen threshold.') |
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else: |
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corr = corr |
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return corr |
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def _drop_duplicates(data): |
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''' |
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Provides information and drops duplicate rows. |
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Parameters |
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---------- |
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data: 2D dataset that can be coerced into Pandas DataFrame. |
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Returns |
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------- |
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data: Deduplicated Pandas DataFrame |
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rows_dropped: Index Object of rows dropped. |
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''' |
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data = pd.DataFrame(data).copy() |
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rows_dropped = data[data.duplicated()].index |
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data = data.drop_duplicates() |
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return data, rows_dropped |
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def _memory_usage(data): |
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''' |
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Gives the total memory usage in kilobytes. |
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Parameters |
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---------- |
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data: 2D dataset that can be coerced into Pandas DataFrame. |
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Returns |
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------- |
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memory_usage: float |
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''' |
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data = pd.DataFrame(data).copy() |
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memory_usage = round(data.memory_usage(index=True, deep=True).sum()/1024, 2) |
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return memory_usage |
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def _missing_vals(data): |
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''' |
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Gives metrics of missing values in the dataset. |
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Parameters |
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---------- |
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data: 2D dataset that can be coerced into Pandas DataFrame. |
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Returns |
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------- |
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mv_total: float, number of missing values in the entire dataset |
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mv_rows: float, number of missing values in each row |
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mv_cols: float, number of missing values in each column |
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mv_rows_ratio: float, ratio of missing values for each row |
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mv_cols_ratio: float, ratio of missing values for each column |
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''' |
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data = pd.DataFrame(data).copy() |
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mv_rows = data.isna().sum(axis=1) |
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mv_cols = data.isna().sum(axis=0) |
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mv_total = data.isna().sum().sum() |
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mv_rows_ratio = mv_rows/data.shape[1] |
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mv_cols_ratio = mv_cols/data.shape[0] |
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return {'mv_total': mv_total, |
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'mv_rows': mv_rows, |
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'mv_cols': mv_cols, |
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'mv_rows_ratio': mv_rows_ratio, |
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'mv_cols_ratio': mv_cols_ratio} |
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def _validate_input_0_1(value, desc): |
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if value < 0 or value > 1: |
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raise ValueError(f'Input value for {desc} is {value} but should be a float in the range 0 <= {desc} <=1.') |
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def _validate_input_bool(value, desc): |
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if not(isinstance(value, bool)): |
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raise ValueError(f'Input value for {desc} is {value} but should be boolean.') |
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akanz1 /
klib
