Update README.md

README.md

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+# overfitting issue
+I use this colab:
+https://colab.research.google.com/drive/1AXh3G3-VmbMWlwbSvesVIurzNlcezTce?usp=sharing
+
+to Fine tuning LayoutLMv2ForTokenClassification on CORD dataset
+
+here is the result:
+https://huggingface.co/doc2txt/layoutlmv2-finetuned-cord
+
+* F1: 0.9665
+
+and indeed the result are pretty amazing when running on the test set,
+however when running on any other receipt (printed or pdf) the result are completely off
+
+So from some reason the model is overfitting to the cord dataset, even though I use similar images for testing.
+
+I don't think that there is a **Data leakage** unless the cord DS is not clean (which I assume it is clean)
+
+What could be the reason for this?
+Is it some inherent property of LayoutLM?
+The LayoutLM models are somewhat old, and it seems deserted...
+
+I don't have much experience so I would appreciate any info
+Thanks
 
 # layoutlmv2-finetuned-cord