### What are your motivations for creativity?

- I want to make a change.
- It makes me happy! It is a need of my mind.

### How to be creative for a thing?

There are two steps:
- See the thing as every people see it
- Think about a new different thing from it

### How to think about a new different thing?

There are two ways:
- Forget all things you have already known.

This was what I have learned from the following great book:

 source: Amazon.com
Well! A physical whack on the side of your head is needed sometimes but the meaning behind is that you need to break these 9 following locks on your mind. Remove them!

## The lock #1: "The correct answer"

We all learn from schools that there is only one correct answer to a question. For example, a proposition is only true or false in Algebra. In reality, there are always some answers to a question basing on a point of view. For example, number 6 becomes number 9 if you look it in the opposite.

## The lock #2: "That is not logic"

There are two kinds of thoughts: soft thinking and hard thinking. Soft thinking focuses on finding a relationship among things. On the other hand, hard thinking focuses on the differences between things. The metaphor is a technique of soft thinking which needed for creativity.

## The lock #3: "Follow the rules"

Sometimes, creativity is not always a contribution but a damage. However, in order to create a new model, we need to break an old model. Break the rules!

## The lock #4: "Be realistic"

Answering the question "if...then what happens?" is useful somehow. For example:

- Imagine if what other people (your inspirational ones) will do in your situation. E.g: I sometimes say to myself when I face an issue: "What will Mr. A do in this situation?"

- Imagine if you are what you think. E.g: Imagine you are a paper; what are your characteristics to make you more convenient for users?

- Imagine an idea which is obviously not realistic. According to this idea, you can come up with a better realistic one. E.g: original idea: the Government will give money for whom put trash into trash bins. Improved idea: every time people put trash into trash bins, they will receive a random fun from the trash bins.

## The lock #5: "Play is frivolous"

"If necessity is the mother of invention, then play is its father". There is no doubt about it!

## The lock #6: "That is not in my field"

Specialization is necessary in most of the cases; however, bringing a knowledge from a field to another field is really useful as well.

## The lock #7: "Don't be silly"

Actually, a comedian is smart. He/she always thinks in different ways. It is like a movement of a car, sometimes it needs to go back in order to go straight.

## The lock #8: "Avoid ambiguity"

People avoid ambiguity because it results in the misunderstanding in communication. However, just keep listening to your dreams and playing with it.

## The lock #9: "Mistakes are wrong"

In most of the case, a mistake can result in a very bad situation. However, a mistake sometimes helps you come up with some new approaches.

Reference:
[1]. Roger von Oech, A Whack On the Side of the Head

### AngularJS - Build a custom validation directive for using multiple emails in textarea

AngularJS already supports the built-in validation with text input with type email. Something simple likes the following:
<input name="input" ng-model="email.text" required="" type="email" /> <span class="error" ng-show="myForm.input.$error.email"> Not valid email!</span> However, I used a text area and I wanted to enter some email addresses that's saparated by a comma (,). I had a short research and it looked like AngualarJS has not supported this functionality so far. Therefore, I needed to build a custom directive that I could add my own validation functions. My validation was done only on client side, so I used the$validators object.

Note that, there is the $asyncValidators object which handles asynchronous validation, such as making an$http request to the backend.

This is just my implementation on my project. In order to understand that, I supposed you already had experiences with Angular…

### Creating a Chatbot with RiveScript in Java

Motivation"Artificial Intelligence (AI) is considered a major innovation that could disrupt many things. Some people even compare it to the Internet. A large investor firm predicted that some AI startups could become the next Apple, Google or Amazon within five years"
- Prof. John Vu, Carnegie Mellon University.

Using chatbots to support our daily tasks is super useful and interesting. In fact, "Jenkins CI, Jira Cloud, and Bitbucket" have been becoming must-have apps in Slack of my team these days.

There are some existing approaches for chatbots including pattern matching, algorithms, and neutral networks. RiveScript is a scripting language using "pattern matching" as a simple and powerful approach for building up a Chabot.
Architecture Actually, it was flexible to choose a programming language for the used Rivescript interpreter like Java, Go, Javascript, Python, and Perl. I went with Java.

Used Technologies and ToolsOracle JDK 1.8.0_151Apache Maven 3.5…

### Styling Sort Icons Using Font Awesome for Primefaces' Data Table

So far, Primefaces has used image sprites for displaying the sort icons. This leads to a problem if we want to make a different style for these icons; for example, I would make the icon "arrow up" more blurry at the first time the table loading because I want to highlight the icon "arrow down". I found a way that I can replace these icons with Font Awesome icons.

We will use "CSS Pseudo-classes" to achieve it. The hardest thing here is that we should handle displaying icons in different cases. There is a case both "arrow up" and "arrow down" showing and other case is only one of these icons is shown.

.ui-sortable-column-icon.ui-icon.ui-icon-carat-2-n-s { background-image: none; margin-left: 5px; font-size: 1.1666em; position: relative; } .ui-sortable-column-icon.ui-icon.ui-icon-carat-2-n-s:not(.ui-icon-triangle-1-s)::before { content: "\f106"; font-family: "FontAwesome"; position: absolut…

### Math fundamentals and Katex

It was really tough for me to understand many articles about data science due to the requirements of understanding mathematics (especially linear algebra). I’ve started to gain some basic knowledges about Math by reading a book first.The great tool Typora and stackedit with supporting Katex syntax simply helps me to display Math-related symbols.Let’s start!The fundamental ideas of mathematics: “doing math” with numbers and functions. Linear algebra: “doing math” with vectors and linear transformations.1. Solving equationsSolving equations means finding the value of the unknown in the equation. To find the solution, we must break the problem down into simpler steps. E.g:x2−4=45x2−4+4=45+4x2=49x=49∣x∣=7x=7 or x=−7\begin{aligned} x^2 - 4 &= 45\\ x^2 - 4 + 4 &= 45 + 4\\ x^2 &= 49\\ \sqrt{x}&=\sqrt{49}\\ |x| &= 7\\ x=7 &\text{ or } x=-7 \end{aligned}x2−4x2−4+4x2x​∣x∣x=7​=45=45+4=49=49​=7 or x=−7​2. NumbersDefinitions
Mathematicians like to classify the d

### Applying pipeline “tensorflow_embedding” of Rasa NLU

According to this nice article, there was a new pipeline released using a different approach from the standard one (spacy_sklearn). I wanted to give it a try to see whether it can help with improving bot’s accuracy.

After applying done, I gave an evaluation of “tensorflow_embedding”. It seemed to work better a bit. For example, I defined intents “greet” and “goodbye” with some following messages in my training data.
## intent:greet- Hey! How are you? - Hi! How can I help you? - Good to see you! - Nice to see you! - Hi - Hello - Hi there ## intent:goodbye- Bye - Bye Bye - See you later - Take care - Peace In order to play around with Rasa NLU, I created a project here. You can have a look at this change from this pull request. Yay!

When I entered message “hi bot”, then bot with “tensorflow_embedding” could detect intent “greet” with better confidence scores rather than bot with “spacy_sklearn”. The following are responses after executing curl -X POST localhost:5000/parse -d '{&qu…