Letters of the Alphabet

This data contains 460 samples of alphabet letters, where each sample is a 30x30 pixel image represented by 900 columns in the csv followed by a column representing the right output (i.e. 'A' would be represented by the number 1). Each line in the csv is a sample.本数据集共包含460个字母样本，每个样本均为一张30×30像素的图像。在逗号分隔值（Comma-Separated Values，CSV）文件中，每个样本由900列像素数据表示，其后紧跟一列用于标注正确输出结果（例如字母'A'可由数字1指代）。该CSV文件中的每一行对应一个样本。