Update README.md

Updated model_description to provide more context.

README.md

@@ -7,10 +7,11 @@ tags:
 - traits
 pipeline_tag: image-segmentation
 model_description: >-
-  This model takes in an image of a fish and segments out traits.
+  This CNN-based model takes in an image of a fish and segments out traits.
   The segmentation model was first trained on ImageNet (Deng et al., 2009),
-  and then the model was fine-tuned on a specific set of image data 
-  relevant to the domain: Illinois Natural History Survey Fish Collection (INHS Fish).
+  and then fine-tuned, using the Feature Pyramid Network (FPN) architecture, on a
+  domain-relevant set of image data: Illinois Natural History Survey Fish Collection 
+  (INHS Fish).
 ---
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