矩阵乘法apache猪

Question

我正在尝试在猪拉丁语中进行矩阵乘法。这是我到目前为止的尝试：

A = COGROUP matrix1...

然而，这不起作用。

我停了下来

ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1200: <line 14, column 37>  mismatched input 'matrix1' expecting LEFT_PAREN

带

{{1}}

Answer 1

经过一番游戏后，我想通了：

matrix1 = LOAD 'mat1' AS (row,col,value);
matrix2 = LOAD 'mat2' AS (row,col,value);

A = JOIN matrix1 BY column FULL OUTER, matrix2 BY row;

B = FOREACH A GENERATE matrix1::row AS m1r, matrix2::column AS m2c, (matrix1::value)*(matrix2::value) AS value;

C = GROUP B BY (m1r, m2c);

multiplied_matrices = FOREACH C GENERATE group.$0 as row, group.$1 as column, SUM(B.value) AS val;

乘法矩阵应以与输入2个矩阵相同的格式（行，列，值）返回matrix1 * matrix2的乘积。