Update README.md

README.md

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-Pruned language model originated from Vicuna-13B.
+This model is a weight-pruned large language model originated from Vicuna-13B. 
+Language model pruning is a technique used to reduce the size and computational requirements of language models, 
+making them more efficient for deployment without significantly sacrificing their performance or accuracy.
+
+This model uses structured pruning instead of unstructured pruning. 
+The structured pruning removes entire units or channels (e.g., neurons, layers, or filter channels in trnasformer). 
+This approach can lead to more efficient computational gains since it aligns better with how hardware utilizes data, 
+but it may have a more significant impact on model performance.
+However, the unstructured pruning, remove individual weights across the model without regard to the structure of the network. 
+While it can lead to significant reductions in model size, 
+it may not always translate to speed gains since the resulting sparse matrices might not be efficiently handled by all hardware.