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import io
import random
from typing import List, Tuple
import aiohttp
import panel as pn
from PIL import Image
from transformers import CLIPModel, CLIPProcessor
pn.extension(design="bootstrap", sizing_mode="stretch_width")
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",
}
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"]
@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
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()))
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",
)
input_widgets = pn.Column(
"##### 😊 Click randomize or paste a URL to start classifying!",
pn.Row(image_url, randomize_url),
class_names,
)
# 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,
)
title = "Panel Demo - Image Classification"
pn.template.BootstrapTemplate(
title=title,
main=main,
main_max_width="min(50%, 698px)",
header_background="#F08080",
).servable(title=title) |