# Classifier Model Predicting

In the previous section, we have trained a classifier model. In this section, we will use this model to classify objects.

### Install an SD Card

The trained model will be stored on an SD card, without an SD card we won’t be able to save this model.

<figure><img src="https://kittenbothk.readthedocs.io/en/latest/_images/022.png" alt=""><figcaption></figcaption></figure>

### Running a Model

<figure><img src="https://kittenbothk-eng.readthedocs.io/en/latest/_images/mcbanner.png" alt=""><figcaption></figcaption></figure>

#### **Loading Extensions**

Search "KOI" in the search bar.

<figure><img src="https://kittenbothk.readthedocs.io/en/latest/_images/koi_search.png" alt=""><figcaption></figcaption></figure>

Or copy and paste the following link to the search bar.

**<https://github.com/KittenBot/pxt-koi>**

Blocks for machine learning:

<figure><img src="https://kittenbothk-eng.readthedocs.io/en/latest/_images/8.png" alt=""><figcaption></figcaption></figure>

#### Sample Program:

{% embed url="<https://makecode.microbit.org/_brxd3HUKCCxc>" %}

```
The model can be saved in a .bin or .json file.
e.g. aaa.json or aaa.bin
```

### Program Flow

1: Download the program to the Micro:bit.

2: Press button A to load the classifier model.

3: Put the object in front of the camera. Press button B to run the classifier.

4: The tag of the object will be displayed on the Micro:bit.

#### Demo video:

{% embed url="<https://www.youtube.com/watch?feature=youtu.b&v=UsjingLwnHc>" %}

### Sample Code:

[Classifier Running (Extension0.5.7)](https://makecode.microbit.org/_a4uJT9TgVPba)

### Extension Version and Updates

There may be updates to extensions periodically, please refer to the following link to update/downgrade your extension.

[Makecode Extension Update](https://kittenbothk-eng.readthedocs.io/en/latest/Makecode/makecode_extensionUpdate.html)

### FAQ

#### 1: There is no reaction after pressing the buttons on the Micro:bit.

· A: This is because KOI has a longer boot time than Micro:bit. When the power is turned on, Micro:bit has already ran the code for KOI initialization before KOI is ready.

· Solution: Reset your Micro:bit after KOI has been turned on. (The trick is to let KOI power on completely before initialization.)

#### 2: Does KOI work with 3V input?

· A: No, KOI only works with 5V.

#### 3: KOI gives a warning message when I try to train a classifier.

· A: The classifier hasn’t been reset.

· Solution: Run the block for classifier reset, KOI will display a success message.


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