Update README.md

README.md

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 We trained a language model to **automatically score the IELTS (International English Language Testing System) essays** by using massive the training dataset by human raters. 
 
-The impressive result in the test dataset is as follows: **Accuracy = 0.82, F1 Score = 0.81**.
+The training dataset is consisting of 18,000 points of real IELTS exam essays and their official scores. 
+Our model scoring results are measured in five dimensions of task achievement, coherence and cohesion, vocabulary, grammar
+and overall according to the official IELTS standards. **OVERALL** is the composite score of the IELTS essays.
+
+The impressive result in the test dataset is as follows: **Accuracy = 0.82, F1 Score = 0.81**.  As far as the current results are concerned, our model can roughly replace human raters for IELTS essays, but we will continue to optimize it to improve its accuracy
 
 The following is the code to implement the model for scoring new IELTS essays.