X-Git-Url: https://fleuret.org/cgi-bin/gitweb/gitweb.cgi?p=flatland.git;a=blobdiff_plain;f=README.md;h=d6e302caa8068552216f9a9c8b7bb894144b1552;hp=3154c173e378983a8bbbfa155963392af61ab9d2;hb=HEAD;hpb=440654efec7784239bdb56ea08fb315583418cea

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+# Introduction #
+
+This is an implementation of a simple 2d physics simulator usable from
+the pytorch framework.
+
+The main function is
+
+```
+torch.ByteTensor flatland.generate_sequence(bool pulling,
+                                            int nb_sequences,
+                                            int nb_images,
+                                            int image_height, int image_width,
+                                            int nb_shapes,
+                                            bool random_shape_size, bool random_colors)
+```
+
+where
+
+ * `pulling` indicates if one of the shape should be pulled upward,
+ * `nb_sequences` is the number of sequences to generate,
+ * `nb_images` is the number of frames per sequence,
+ * `image_height` and `image_width` is the individual image size,
+ * `nb_shapes` is the number of rectangular shapes in the simulation,
+ * `random_shape_size` states if the shapes should be of different sizes,
+ * `random_colors` states if they should be of different colors.
+
+The returned ByteTensor has five dimensions:
+
+ * Sequence index
+ * Image index
+ * Channel (3 since it is RGB)
+ * Pixel row
+ * Pixel col
+
+Warning: For improper parameters values (e.g. too many shapes, too
+small images), the simulation may be stuck.
+
 # Installation and test #
 
 ```
 make -j -k
-./built.py
-./flatland-test.py --nb_sequences 5 --nb_shapes 6 --nb_images_per_sequence 20
+./test-flatland.py
 ```