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Improve the implementation of the test_set_check() function: faster, supports python 2 and 3, and more fine grain split (32 bits intead of 8)

main
Aurélien Geron 2018-04-03 16:45:53 +02:00
parent a164ffc699
commit 8f6a28e6bc
1 changed files with 147 additions and 122 deletions
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269
02_end_to_end_machine_learning_project.ipynb
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@ -219,26 +219,41 @@
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
"source": [ "source": [
"import hashlib\n", "from zlib import crc32\n",
"\n", "\n",
"def test_set_check(identifier, test_ratio, hash):\n", "def test_set_check(identifier, test_ratio):\n",
" return hash(np.int64(identifier)).digest()[-1] < 256 * test_ratio\n", " return crc32(np.int64(identifier)) & 0xffffffff < test_ratio * 2**32\n",
"\n", "\n",
"def split_train_test_by_id(data, test_ratio, id_column, hash=hashlib.md5):\n", "def split_train_test_by_id(data, test_ratio, id_column):\n",
" ids = data[id_column]\n", " ids = data[id_column]\n",
" in_test_set = ids.apply(lambda id_: test_set_check(id_, test_ratio, hash))\n", " in_test_set = ids.apply(lambda id_: test_set_check(id_, test_ratio))\n",
" return data.loc[~in_test_set], data.loc[in_test_set]" " return data.loc[~in_test_set], data.loc[in_test_set]"
] ]
}, },
{
"cell_type": "markdown",
"metadata": {},
"source": [
"The implementation of `test_set_check()` above works fine in both Python 2 and Python 3. In earlier releases, the following implementation was proposed, which supported any hash function, but was much slower and did not support Python 2:"
]
},
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 14, "execution_count": 14,
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
"source": [ "source": [
"# This version supports both Python 2 and Python 3, instead of just Python 3.\n", "import hashlib\n",
"def test_set_check(identifier, test_ratio, hash):\n", "\n",
" return bytearray(hash(np.int64(identifier)).digest())[-1] < 256 * test_ratio" "def test_set_check(identifier, test_ratio, hash=hashlib.md5):\n",
" return hash(np.int64(identifier)).digest()[-1] < 256 * test_ratio"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"If you want an implementation that supports any hash function and is compatible with both Python 2 and Python 3, here is one:"
] ]
}, },
{ {
@ -246,6 +261,16 @@
"execution_count": 15, "execution_count": 15,
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
"source": [
"def test_set_check(identifier, test_ratio, hash=hashlib.md5):\n",
" return bytearray(hash(np.int64(identifier)).digest())[-1] < 256 * test_ratio"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {},
"outputs": [],
"source": [ "source": [
"housing_with_id = housing.reset_index() # adds an `index` column\n", "housing_with_id = housing.reset_index() # adds an `index` column\n",
"train_set, test_set = split_train_test_by_id(housing_with_id, 0.2, \"index\")" "train_set, test_set = split_train_test_by_id(housing_with_id, 0.2, \"index\")"
@ -253,7 +278,7 @@
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@ -263,7 +288,7 @@
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@ -272,7 +297,7 @@
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@ -301,7 +326,7 @@
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@ -313,7 +338,7 @@
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@ -322,7 +347,7 @@
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@ -331,7 +356,7 @@
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