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pandas DataFrame: replace nan values with average of columns

... perspective it is wrong to first replace NA and then split into train and test... You MUST first split into train and test, then replace NA by mean on train and then apply this stateful preprocessing model to test, see the answer involving sklearn below! – Fabian Werner ...
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Code coverage for Jest

Is there a way to have code coverage in the Javascript Jest testing framework that is built on top of Jasmine? 8 Answers ...
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Purge or recreate a Ruby on Rails database

... You'll also need to run rake db:test:prepare for testing, or else you'll get an error like: Could not find table 'things' (ActiveRecord::StatementInvalid) – s2t2 Feb 17 '13 at 1:49 ...
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Change from SQLite to PostgreSQL in a fresh Rails project

...: utf8 database: project_development pool: 5 username: password: test: &TEST adapter: postgresql encoding: utf8 database: project_test pool: 5 username: password: production: adapter: postgresql encoding: utf8 database: project_production pool: 5 username: pa...
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How to return only the Date from a SQL Server DateTime datatype

...rked different methods of trimming off time from dates and this was the fastest method. Granted the difference was small, but it was clearly faster over a large # of executions. – UnhandledExcepSean Jul 3 '14 at 12:48 ...
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Skip callbacks on Factory Girl and Rspec

I'm testing a model with an after create callback that I'd like to run only on some occasions while testing. How can I skip/run callbacks from a factory? ...
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ADB Install Fails With INSTALL_FAILED_TEST_ONLY

... Looks like you need to modify your AndroidManifest.xml Change android:testOnly="true" to android:testOnly="false" or remove this attribute. If you want to keep the attribute android:testOnly as true you can use pm install command with -t option, but you may need to push the apk to device first...
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Remove a JSON attribute [duplicate]

... Simple: delete myObj.test.key1; share | improve this answer | follow | ...
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Initialising mock objects - MockIto

...ions.initMocks(Object) is not necessary. Mocks are initialized before each test method. The first solution (with the MockitoAnnotations.initMocks) could be used when you have already configured a specific runner (SpringJUnit4ClassRunner for example) on your test case. The second solution (with the...
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Using switch statement with a range of value in each case?

...;& x <= upper; } if (isBetween(num, 1, 5)) { System.out.println("testing case 1 to 5"); } else if (isBetween(num, 6, 10)) { System.out.println("testing case 6 to 10"); } share | improve...