Update model.py

model.py

@@ -15,6 +15,11 @@ from torchvision import transforms
 from tqdm import tqdm
 import torchvision.transforms.functional as TF
 
+MAX_SEQ_LEN = 512
+NUM_NESTED_LEVELS = 10
+MAX_IDENTIFIER_LEN = 15
+PAD_TOKEN, SOS_TOKEN, EOS_TOKEN, UNK_TOKEN = '<PAD>', '<SOS>', '<EOS>', '<UNK>'
+
 TOKEN_REGEX = re.compile(
     r"(\\[a-zA-Z]+(?:\*)?)|(\\\{|\\\}|\\.)|([0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?)|([A-Za-z]+)|([+\-*/=<>!~^_&|%])|([{}()\[\],.;:?'])|(\s+)|(\S)"
 )