fix: work around st.file_uploader bug by providing representative images

dashboard_featurefinder.py

@@ -23,6 +23,7 @@ IMAGE_VECTOR_FILE = "./vectors/test-bs128x8-lr5e-6-adam-ckpt-1.tsv"
 
 # IMAGES_DIR = "/home/shared/data/rsicd_images"
 IMAGES_DIR = "./images"
+DEMO_IMAGES_DIR = "./demo-images"
 
 
 def split_image(X):
@@ -84,17 +85,29 @@ def app():
         tiles are most likely to contain `houses`, and the two bottom right tiles
         are likely to contain `boats`.
 
-        You can try it yourself with your own photographs. 
-        [Unsplash](https://unsplash.com/s/photos/aerial-view) has some good 
-        aerial photographs. You will need to download from Unsplash to your 
-        computer and upload it to the demo app.
+        We have provided a few representative images from [Unsplash](https://unsplash.com/s/photos/aerial-view) 
+        that you can experiment with. Use the image name to put in an initial feature
+        to look for, this will show the original image, and you will get more ideas
+        for features that you can ask the model to identify.
     """)
-    buf = st.file_uploader("Upload Image for Analysis", type=["png", "jpg"])
+    # buf = st.file_uploader("Upload Image for Analysis", type=["png", "jpg"])
+    image_file = st.selectbox("Image File", index=0, 
+                            options=[
+                                "St-Tropez-Port.jpg",
+                                "Acopulco-Bay.jpg",
+                                "Highway-through-Forest.jpg",
+                                "Forest-with-River.jpg",
+                                "Eagle-Bay-Coastline.jpg",
+                                "Multistoreyed-Buildings.jpg",
+                                "Street-View-Malayasia.jpg",
+                            ])
     searched_feature = st.text_input("Feature to find")
+
     if st.button("Find"):
-        ftmp = NamedTemporaryFile()
-        ftmp.write(buf.getvalue())
-        image = plt.imread(ftmp.name)
+        # ftmp = NamedTemporaryFile()
+        # ftmp.write(buf.getvalue())
+        # image = plt.imread(ftmp.name)
+        image = plt.imread(os.path.join("demo-images", image_file))
         if len(image.shape) != 3 and image.shape[2] != 3:
             st.error("Image should be an RGB image")
         if image.shape[0] < 224 or image.shape[1] < 224: