Add application file

app.py

@@ -0,0 +1,80 @@
+import streamlit as st
+from happytransformer import HappyTextToText, TTSettings
+from annotated_text import annotated_text
+import difflib
+
+checkpoint = "team-writing-assistant/t5-base-c4jfleg"
+
+
+def diff_strings(a, b):
+    result = []
+    diff = difflib.Differ().compare(a.split(), b.split())
+    replacement = ""
+    for line in diff:
+        if line.startswith("  "):
+            if len(replacement) == 0:
+                result.append(" ")
+                result.append(line[2:])
+            else:
+                result.append(" ")
+                result.append(("", replacement, "#ffd"))
+                replacement = ""
+                result.append(line[2:])
+        elif line.startswith("- "):
+            if len(replacement) == 0:
+                replacement = line[2:]
+            else:
+                result.append(" ")
+                result.append(("", replacement, "#fdd"))
+                replacement = ""
+        elif line.startswith("+ "):
+            if len(replacement) == 0:
+                result.append(("", line[2:], "#dfd"))
+            else:
+                result.append(" ")
+                result.append((line[2:], replacement, "#ddf"))
+                replacement = ""
+    return result
+
+
+@st.cache(suppress_st_warning=True, allow_output_mutation=True)
+def get_happy_text(model_name):
+    st.write(f"Loading the HappyTextToText model {model_name}, please wait...")
+    return HappyTextToText("T5", model_name)
+
+
+happy_tt = get_happy_text(checkpoint)
+args = TTSettings(num_beams=5, min_length=1)
+
+st.title("Check & Improve English Grammar")
+st.markdown("This writing assistant detects 🔍 and corrects ✍️ grammatical mistakes for you!")
+
+st.subheader("Example text: ")
+col1, col2 = st.columns([1, 1])
+with col1:
+    example_1 = st.button("Speed of light is fastest then speed of sound")
+with col2:
+    example_2 = st.button("Who are the president?")
+
+input_text = st.text_area('Enter your text here')
+button = st.button('Submit')
+
+
+def output(input_text):
+    with st.spinner('Detecting 🔍..'):
+        input_text = "grammar: " + input_text
+        result = happy_tt.generate_text(input_text, args=args)
+        # st.markdown("## " + result.text)
+        diff = diff_strings(input_text[9:], result.text)
+        annotated_text(*diff)
+        
+
+if example_1:
+    output("Speed of light is fastest then speed of sound")
+elif example_2:
+    output("Who are the president?")
+elif input_text:
+    output(input_text)
+  
+st.text("")
+st.text("Built with ❤️")