Update README.md

README.md

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 **PPFT**: Path Planning on Fifty x Thirty <br>
-Our dataset consists of 100 manually selected 50 × 30 maps from a randomly generated collection, each with 10 different start and goal positions. Therefore, there are 1000 samples in total (see Figure 1 for sample visualization). Our data conform to the standard of search-based algorithm environments in a continuous space. Each map includes the following parameters:
+Our dataset consists of 100 manually selected 50 × 30 maps from a randomly generated collection, each with 10 different start and goal positions. Therefore, there are 1000 samples in total. Our data conform to the standard of search-based algorithm environments in a continuous space. Each map includes the following parameters:
 - x range: The minimum and maximum x-coordinates of the environment boundary range as [x min, x max].
 - y range: The minimum and maximum y-coordinates of the environment boundary range as [y min, y max].
 - horizontal barriers: List of horizontal barriers, each represented as [y, x start, x end].