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adumont/shuffle_fraction_of_pandas_column.ipynb

Created August 26, 2019 22:28
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shuffle_fraction_of_pandas_column.ipynb
{
"cells": [
{
"cell_type": "code",
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"metadata": {},
"outputs": [],
"source": [
"import pandas as pd\n",
"import numpy as np"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {},
"outputs": [],
"source": [
"df = pd.DataFrame({'i':range(20),\n",
" 'L':[chr(97+i) for i in range(20)]\n",
" })\n",
"\n",
"df['L2'] = df['L']"
]
},
{
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"metadata": {},
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{
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" </tr>\n",
" <tr>\n",
" <th>L2</th>\n",
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" </tr>\n",
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"text/plain": [
" 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19\n",
"i 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19\n",
"L a b c d e f g h i j k l m n o p q r s t\n",
"L2 a b c d e f g h i j k l m n o p q r s t"
]
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"df.T"
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{
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"(20, 8)"
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"metadata": {},
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],
"source": [
"n_rows=len(df)\n",
"n_shuffle=int(n_rows*0.4)\n",
"n_rows, n_shuffle"
]
},
{
"cell_type": "code",
"execution_count": 12,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"array([ 3, 0, 11, 16, 14, 4, 8, 12])"
]
},
"execution_count": 12,
"metadata": {},
"output_type": "execute_result"
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"source": [
"pick_rows=np.random.permutation(list(range(n_rows)))[0:n_shuffle]\n",
"pick_rows"
]
},
{
"cell_type": "code",
"execution_count": 13,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"array(['l', 'e', 'd', 'q', 'o', 'i', 'm', 'a'], dtype=object)"
]
},
"execution_count": 13,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"shuffled_values=np.random.permutation(df['L2'][pick_rows])\n",
"shuffled_values"
]
},
{
"cell_type": "code",
"execution_count": 14,
"metadata": {},
"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
"C:\\Users\\adumont\\.conda\\envs\\fastai-cpu\\lib\\site-packages\\ipykernel_launcher.py:1: SettingWithCopyWarning: \n",
"A value is trying to be set on a copy of a slice from a DataFrame\n",
"\n",
"See the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy\n",
" \"\"\"Entry point for launching an IPython kernel.\n"
]
}
],
"source": [
"df['L2'][pick_rows]=shuffled_values"
]
},
{
"cell_type": "code",
"execution_count": 15,
"metadata": {},
"outputs": [
{
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" 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19\n",
"i 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19\n",
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