Machine Learning week1
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Machine Learning definition:
Machine learning is a type of artificial intelligence (AI) that provides computers with the ability to learn without being explicitly programmed. (Ref)
Supervised:有供给的且分好类的数据进行预算,Regression是其中一种(前提:已知分类!)
Unsupervised:由供给的数据和machine learning的算法进行数据分类(前提:未知分类!)
Regression:Output 是连续的
Classification: output需要被分类且是离散分布
IDE: Octave 比用Java等常用语操作平台更简单,有内置算法
Model And Cost Function
-cost function(squared error function)
-Gradient Descent(to minimise,to calculate simultaneously[用最原始值])
optima指的是3D图里的最优位置,可以选择阿尔法为恒定(fixed),optima是来自global optimum里, GRADIENT DESCENT不能保证得到最小的优解,阿尔法的值对gradient descent的覆盖范围没有影响。
“Convex Function”(Linear regression)只有一个local optima;“Batch” gradient descent.
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-Linear Algebra
Matrix => row * column Dimension 又row与column的坐标找特别的数(大写),
相加的两个matrix 的dimension要一样
相乘的matrix和vector结果为一vector, linear regression可以construct,for loop可以转换成这个
相乘的两个matrix可以换成两个matrix*vector计算,结果的列数与第二个matrix为准,结果的行数与第一个matrix为准[not commutative],两个matrix的dimension不能一样。
A*B*C => A*(B*C)=(A*B)*C
Identity Matrix => I[mn] * A[nn] = A[mm] * I[mn] = A[mn]
Inverse => A*(1/A) = (1/A)*A = I (No inverse = singular = degenerate)
Transpose => 第N个row变成第N个column, B[ij] = A[ji]
Vector => n*1 Dimension, index指从哪个数开始累积(小写)
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