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1-D Array Indexing Use bracket notation [ ] to get the value at a specific index. Remember that indexing starts at 0. Output: array([ 0, 1, 2, 3, 4, 5 阅读全文
posted @ 2019-01-05 03:23
Sherrrry
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The Dataset was acquired from https://www.kaggle.com/c/titanic For data preprocessing, I firstly defined three transformers: DataFrameSelector: Select 阅读全文
posted @ 2019-01-04 06:50
Sherrrry
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In the former article "Data Preparation by Pandas and Scikit-Learn", we discussed about a series of steps in data preparation. Scikit-Learn provides t 阅读全文
posted @ 2019-01-02 09:40
Sherrrry
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In this article, we dicuss some main steps in data preparation. Drop Labels Firstly, we drop labels for train set. Here we use drop() method in Pandas 阅读全文
posted @ 2019-01-02 09:34
Sherrrry
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Train model: Show parameters of best model: Show the score of train set: Fit on test set: Show the score of test set: More about GridSearchCV: https:/ 阅读全文
posted @ 2019-01-02 05:06
Sherrrry
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1. Using for-loop Iterate along row axis: Output: [1 2 3] [4 5 6] Iterate by index: Output: [1 2 3] [4 5 6] Iterate by row and index: Iterate by row a 阅读全文
posted @ 2019-01-02 04:49
Sherrrry
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1. Reshape: The np.reshape() method will give a new shape to an array without changing its data. Note that the new shape should be compatible with the 阅读全文
posted @ 2019-01-02 04:05
Sherrrry
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数组拼接方法一 思路：首先将数组转成列表，然后利用列表的拼接函数 、`extend()`等进行拼接处理，最后将列表转成数组。 示例1： [1, 2, 5, 10, 12, 15] array([ 1, 2, 5, 10, 12, 15]) 该方法只适用于简单的一维数组拼接，由于转换过程很耗时间，对于 阅读全文
posted @ 2019-01-01 11:17
Sherrrry
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Here is a function in Numpy module which could apply a function to 1D slices along the Given Axis. It works like apply funciton in Pandas. This functi 阅读全文
posted @ 2019-01-01 10:42
Sherrrry
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1、错误信息如下： ImportError: No module named numpy如果什么都没装，请出门右转，通过pip安装numpy即可！命令如下： 如果连pip都没有，请先安装pip！命令如下： 2、原因分析： 明明已经安装pip install xxx，为什么还报错找不到对应的库呢？其实 阅读全文
posted @ 2019-01-01 06:58
Sherrrry
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