paper：An End-to-End Trainable Neural Network for Image-based Sequence Recognition and Its Application to Scene Text Recognition

Process different text texts, and store image path and label label in LMDB database in one-to-one correspondence. Here, the text format I processed is as follows：

./9/7/186_densely_20626.jpg 20626
./9/7/185_acidic_759.jpg 759
...

Extract useful information from text 186_densely_20626.jpg , build target path and correspond to label: densely

Remove the following characters when reading LMDB data

b'******' ——→ '******'