Update app.py

app.py

@@ -1,147 +1,117 @@
-import io
-import random
-from typing import List, Tuple
-
-import aiohttp
+# load up the libraries
 import panel as pn
-from PIL import Image
-from transformers import CLIPModel, CLIPProcessor
+import pandas as pd
+import altair as alt
+from vega_datasets import data
 
-pn.extension(design="bootstrap", sizing_mode="stretch_width")
+# we want to use bootstrap/template, tell Panel to load up what we need
+pn.extension(design='bootstrap')
 
-ICON_URLS = {
-    "brand-github": "https://github.com/holoviz/panel",
-    "brand-twitter": "https://twitter.com/Panel_Org",
-    "brand-linkedin": "https://www.linkedin.com/company/panel-org",
-    "message-circle": "https://discourse.holoviz.org/",
-    "brand-discord": "https://discord.gg/AXRHnJU6sP",
-}
+# we want to use vega, tell Panel to load up what we need
+pn.extension('vega')
 
+# create a basic template using bootstrap
+template = pn.template.BootstrapTemplate(
+    title='SI649 Walkthrough',
+)
 
-async def random_url(_):
-    pet = random.choice(["cat", "dog"])
-    api_url = f"https://api.the{pet}api.com/v1/images/search"
-    async with aiohttp.ClientSession() as session:
-        async with session.get(api_url) as resp:
-            return (await resp.json())[0]["url"]
+# the main column will hold our key content
+maincol = pn.Column()
 
+# add some markdown to the main column
+maincol.append("# Markdown Title")
+maincol.append("I can format in cool ways. Like **bold** or *italics* or ***both*** or ~~strikethrough~~ or `code` or [links](https://panel.holoviz.org)")
+maincol.append("I am writing a link [to the streamlit documentation page](https://docs.streamlit.io/en/stable/api.html)")
+maincol.append('![alt text](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Irises-Vincent_van_Gogh.jpg/314px-Irises-Vincent_van_Gogh.jpg)')
 
-@pn.cache
-def load_processor_model(
-    processor_name: str, model_name: str
-) -> Tuple[CLIPProcessor, CLIPModel]:
-    processor = CLIPProcessor.from_pretrained(processor_name)
-    model = CLIPModel.from_pretrained(model_name)
-    return processor, model
+# load up a dataframe and show it in the main column
+cars_url = "https://raw.githubusercontent.com/altair-viz/vega_datasets/master/vega_datasets/_data/cars.json"
+cars = pd.read_json(cars_url)
+temps = data.seattle_weather()
 
+maincol.append(temps.head(10))
 
-async def open_image_url(image_url: str) -> Image:
-    async with aiohttp.ClientSession() as session:
-        async with session.get(image_url) as resp:
-            return Image.open(io.BytesIO(await resp.read()))
+# create a basic chart
+hp_mpg = alt.Chart(cars).mark_circle(size=80).encode(
+    x='Horsepower:Q',
+    y='Miles_per_Gallon:Q',
+    color='Origin:N'
+)
 
+# dispaly it in the main column
+# maincol.append(hp_mpg)
 
-def get_similarity_scores(class_items: List[str], image: Image) -> List[float]:
-    processor, model = load_processor_model(
-        "openai/clip-vit-base-patch32", "openai/clip-vit-base-patch32"
-    )
-    inputs = processor(
-        text=class_items,
-        images=[image],
-        return_tensors="pt",  # pytorch tensors
-    )
-    outputs = model(**inputs)
-    logits_per_image = outputs.logits_per_image
-    class_likelihoods = logits_per_image.softmax(dim=1).detach().numpy()
-    return class_likelihoods[0]
-
-
-async def process_inputs(class_names: List[str], image_url: str):
-    """
-    High level function that takes in the user inputs and returns the
-    classification results as panel objects.
-    """
-    try:
-        main.disabled = True
-        if not image_url:
-            yield "##### ⚠️ Provide an image URL"
-            return
-    
-        yield "##### ⚙ Fetching image and running model..."
-        try:
-            pil_img = await open_image_url(image_url)
-            img = pn.pane.Image(pil_img, height=400, align="center")
-        except Exception as e:
-            yield f"##### 😔 Something went wrong, please try a different URL!"
-            return
-    
-        class_items = class_names.split(",")
-        class_likelihoods = get_similarity_scores(class_items, pil_img)
-    
-        # build the results column
-        results = pn.Column("##### 🎉 Here are the results!", img)
-    
-        for class_item, class_likelihood in zip(class_items, class_likelihoods):
-            row_label = pn.widgets.StaticText(
-                name=class_item.strip(), value=f"{class_likelihood:.2%}", align="center"
-            )
-            row_bar = pn.indicators.Progress(
-                value=int(class_likelihood * 100),
-                sizing_mode="stretch_width",
-                bar_color="secondary",
-                margin=(0, 10),
-                design=pn.theme.Material,
-            )
-            results.append(pn.Column(row_label, row_bar))
-        yield results
-    finally:
-        main.disabled = False
-
-
-# create widgets
-randomize_url = pn.widgets.Button(name="Randomize URL", align="end")
-
-image_url = pn.widgets.TextInput(
-    name="Image URL to classify",
-    value=pn.bind(random_url, randomize_url),
-)
-class_names = pn.widgets.TextInput(
-    name="Comma separated class names",
-    placeholder="Enter possible class names, e.g. cat, dog",
-    value="cat, dog, parrot",
-)
+# create a basic slider
+simpleslider = pn.widgets.IntSlider(name='Simple Slider', start=0, end=100, value=0)
 
-input_widgets = pn.Column(
-    "##### 😊 Click randomize or paste a URL to start classifying!",
-    pn.Row(image_url, randomize_url),
-    class_names,
-)
+# generate text based on slider value
+def square(x):
+    return f'{x} squared is {x**2}'
 
-# add interactivity
-interactive_result = pn.panel(
-    pn.bind(process_inputs, image_url=image_url, class_names=class_names),
-    height=600,
-)
 
-# add footer
-footer_row = pn.Row(pn.Spacer(), align="center")
-for icon, url in ICON_URLS.items():
-    href_button = pn.widgets.Button(icon=icon, width=35, height=35)
-    href_button.js_on_click(code=f"window.open('{url}')")
-    footer_row.append(href_button)
-footer_row.append(pn.Spacer())
-
-# create dashboard
-main = pn.WidgetBox(
-    input_widgets,
-    interactive_result,
-    footer_row,
+# bind the slider to the function and hold the output in a row
+row = pn.Column(pn.bind(square,simpleslider))
+
+# add both slider and row
+maincol.append(simpleslider)
+maincol.append(row)
+
+# variable to track state of visualization
+flip = False
+
+# function to either return the vis or a message
+def makeChartVisible(val):
+    global flip  # grab the variable outside the function
+    if (flip == True):
+        flip = not flip             # flip to False
+        return pn.pane.Vega(hp_mpg) # return the vis
+    else:
+        flip = not flip             # flip to true and return text
+        return pn.panel("Click the button to see the chart")
+    
+# add a button and then create the binding
+btn = pn.widgets.Button(name='Click me')
+row = pn.Row(pn.bind(makeChartVisible, btn))
+
+# add button and new row to main column
+maincol.append(btn)
+maincol.append(row)
+
+# create a base chart
+basechart = alt.Chart(cars).mark_circle(size=80,opacity=0.5).encode(
+    x='Horsepower:Q',
+    y='Acceleration:Q',
+    color="Origin:N"
 )
 
-title = "Panel Demo - Image Classification"
-pn.template.BootstrapTemplate(
-    title=title,
-    main=main,
-    main_max_width="min(50%, 698px)",
-    header_background="#F08080",
-).servable(title=title)
+# create something to hold the base chart
+currentoption = pn.panel(basechart)
+
+# create a selection widget
+select = pn.widgets.Select(name='Select', options=['Horsepower','Acceleration','Miles_per_Gallon'])
+
+# create a function to modify the basechart that is being
+# held in currentoption
+def changeOption(val):
+    # grab what's there now
+    chrt = currentoption.object
+    # change the encoding based on val
+    chrt = chrt.encode(
+        y=val+":Q"
+    )
+    # replace old chart in currentoption with new one
+    currentoption.object = chrt
+
+# append the selection
+maincol.append(select)
+# append the binding (in thise case nothing is being returned by changeOption, so...)
+chartchange = pn.Row(pn.bind(changeOption, select))
+# ... we need to also add the chart
+maincol.append(chartchange)
+maincol.append(currentoption)
+
+# add the main column to the template
+template.main.append(maincol)
+
+# Indicate that the template object is the "application" and serve it
+template.servable(title="SI649 Walkthrough")