In 2006, Suzuki, Tsurusaki, and Kodama did some research on the distribution of an endangered burrowing spider on different beaches in Japan. Refer to https://www.jstage.jst.go.jp/article/asjaa/55/2/55_2_79/_pdf for more information.
Here's some data about the grain size and the presence of the spiders:
| Grain size (mm) | Spider present |
| 0.245 | Absent |
| 0.247 | Absent |
| 0.285 | Present |
| 0.299 | Present |
| 0.327 | Present |
| 0.347 | Present |
| 0.356 | Absent |
| 0.36 | Present |
| 0.363 | Absent |
| 0.364 | Present |
| 0.398 | Absent |
| 0.4 | Present |
| 0.409 | Absent |
| 0.421 | Present |
| 0.432 | Absent |
| 0.473 | Present |
| 0.509 | Present |
| 0.529 | Present |
| 0.561 | Absent |
| 0.569 | Absent |
| 0.594 | Present |
| 0.638 | Present |
| 0.656 | Present |
| 0.816 | Present |
| 0.853 | Present |
| 0.938 | Present |
| 1.036 | Present |
| 1.045 | Present |
We will use this data to train the algorithm. The result Absent will be denoted by 0 and Present by 1.