数据库两个基本概念

RowId

ROWID是每条记录在数据库中的唯一标识。

优化方案

减少数据访问

索引 (Index)

索引是啥

B-TREE索引也称为平衡树索引(Balance Tree)，它是一种按字段排好序的树形目录结构，主要用于提升查询性能和唯一约束支持

DEEPLEARNING.AI NOTES FOR LESSON1_WEEK4 QUIZ

A 5-layer Neural Network

Because it is very similar with 2-layer neural network, I only post the source code rather than go through details with it, and some key points have been written into comments of code.

DEEPLEARNING.AI NOTES FOR LESSON1_WEEK3 QUIZ

Reminder: The general methodology to build a Nerual Network is to:

1. Define the neural network structure (# of input units, # of hidden units, etc.).
2. Initialize the model's parameters
3. Loop:
• Implement forward propagation
• Compute loss
• Implement backward propagation to get the gradients