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Comparing iteration and vectorisation with a simple example
import perfplot
import pandas as pd
def vec(df):
return df['A'] + df['B']
def vec_numpy(df):
return df['A'].to_numpy() + df['B'].to_numpy()
def list_comp(df):
return [x + y for x, y in zip(df['A'], df['B'])]
def apply(df):
return df.apply(lambda row: row['A'] + row['B'], axis=1)
def iterrows(df):
result = []
for index, row in df.iterrows():
result.append(row['A'] + row['B'])
return result
df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
kernels = [vec, vec_numpy, list_comp, apply, iterrows]
perfplot.show(
setup=lambda n: pd.concat([df] * n, ignore_index=True),
kernels=kernels,
labels=[str(k.__name__) for k in kernels],
n_range=[2**k for k in range(16)],
xlabel='N',
logx=True,
logy=True)
@smurpau

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@smurpau smurpau commented Jul 23, 2021

Oddly, this raises ZeroDivisionError non-deterministically.

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