1.2.1 Warmup exercise: sigmoid function

As the sigmoid function is defined as:

1

g = 1./(1+exp(-z))

1.2.2 Cost function and gradient

2014-2018

The LittleMaster once lived in the capital for several years.

When I first arrived at the capital, I experienced a critical hit at the beginning. Although I was mentally prepared, I was still shocked by the air I breathed every day.

This is my process record of attempting to learn machine learning in the course.

I heard about artificial intelligence a year ago, but as an elderly person who finds it difficult to accept new things, I never really studied it. However, it seems that I will lose my job in this AI revolution. Therefore, I will make an effort to learn it. However, I am old and can’t learn, and I have no confidence that I will be able to master it one day. 😂😂😂

Osaka

My friend bought a two-day Osaka travel pass early on, so all of the following activities are free 🆓, free 🆓, free 🆓.

Nara 🦌 Uji 🍦 Universal Studios Osaka

On the second day, take the JR to Nara to see the deer 🦌

Senjōju ⛩️

I found out that this is called Senjōju ⛩️

Climbed for an hour

Little Master 🧙‍♀️ says it’s okay, since we’re already here, we might as well climb to the top of the mountain

But my buddy couldn’t go any further

Looking at the map, Senjōju looks bigger when far away and smaller up close, Little Master 🧙‍♀️ thinks it’s drawn quite vividly
Looks like we’re still halfway up the mountain, and if we insist on climbing higher, it might delay the rest of our trip

So we decided to go down together

When we came back, we found out that there wasn’t much more to go up
Because the torii ⛩️ really gets smaller as you go up

Kyoto

After returning from Italy during the eleven-day holiday,
possibly because the credit card was maxed out, China Merchants Bank sent a premium card.

Half a month later, LittleMaster’s childhood friend was going to Japan to see autumn leaves,
and had already planned the itinerary:
Kyoto -> Nara -> Kinosaki -> Osaka
Unfortunately, it was difficult to take time off work, so only tickets for early November were booked, hoping to catch the end of the autumn leaves season.

When LittleMaster saw that it was an area in Kansai that he had never been to,
he immediately indicated that he had obtained a three-year multiple entry visa in June
and could go together.

Although there were only two weeks left before departure, time was tight,
luckily managed to get a flight ticket, worked hard for two weeks, and finished the tasks ahead of schedule.
After submitting the code to the organization, the second trip to Japan 🇯🇵 began.

At the time of buying the ticket, I didn’t know what kind of plane it would be.
When I arrived at the airport and saw this small and thin airplane, everyone was stunned.
It turned out to be a Boeing 737.
Although the MAX incident hadn’t happened at that time,
I still worried that the plane wouldn’t be able to fly and would crash into the sea,
turning instead to the Lost storyline.

Vatican City

So Vatican City is actually inside Italy.
Its area is smaller than a regular university in China,
and its territory is not open to the public except for the museums.