app.py

import os
import gradio as gr
import plotly.graph_objects as go
import sys
import torch
from huggingface_hub import hf_hub_download
import numpy as np
import random
# import argparse # Not strictly needed for weights_only=False, but good practice if dealing with argparse.Namespace

os.system("git clone https://github.com/luost26/diffusion-point-cloud")
sys.path.append("diffusion-point-cloud")

#Codes reference : https://github.com/luost26/diffusion-point-cloud

from models.vae_gaussian import *
from models.vae_flow import *

airplane_model_path = hf_hub_download("SerdarHelli/diffusion-point-cloud", filename="GEN_airplane.pt", revision="main")
# IMPORTANT: GEN_chair.pt must be present in the root directory where this script is run.
# This script does NOT download GEN_chair.pt. You need to manually place it there.
# The original repository (https://github.com/luost26/diffusion-point-cloud)
# mentions downloading checkpoints from Google Drive.
chair_model_path = "./GEN_chair.pt"

device = 'cuda' if torch.cuda.is_available() else 'cpu'

# --- Start of PyTorch 2.6+ loading considerations ---
# Option 1: Set weights_only=False for each load (Simpler, if you trust the source)
# This is the approach being applied here as per previous interactions.

ckpt_airplane = torch.load(airplane_model_path, map_location=torch.device(device), weights_only=False)
ckpt_chair = torch.load(chair_model_path, map_location=torch.device(device), weights_only=False) # <--- FIX APPLIED HERE

# Option 2: For a more robust/secure approach with PyTorch 2.6+ (if you have many models)
# You could do this at the top, after importing torch and argparse:
# import argparse
# torch.serialization.add_safe_globals([argparse.Namespace])
# Then, the torch.load calls below would not need weights_only=False (they'd use the default weights_only=True)
# ckpt_airplane = torch.load(airplane_model_path, map_location=torch.device(device))
# ckpt_chair = torch.load(chair_model_path, map_location=torch.device(device))
# --- End of PyTorch 2.6+ loading considerations ---


def seed_all(seed):
    torch.manual_seed(seed)
    np.random.seed(seed)
    random.seed(seed)

def normalize_point_clouds(pcs, mode):
    if mode is None:
        return pcs
    for i in range(pcs.size(0)):
        pc = pcs[i]
        if mode == 'shape_unit':
            shift = pc.mean(dim=0).reshape(1, 3)
            scale = pc.flatten().std().reshape(1, 1)
        elif mode == 'shape_bbox':
            pc_max, _ = pc.max(dim=0, keepdim=True)  # (1, 3)
            pc_min, _ = pc.min(dim=0, keepdim=True)  # (1, 3)
            shift = ((pc_min + pc_max) / 2).view(1, 3)
            scale = (pc_max - pc_min).max().reshape(1, 1) / 2
        else: # Fallback if mode is not recognized, though your code doesn't use this branch with current inputs
            shift = 0
            scale = 1
        
        # Prevent division by zero or very small scale
        if scale < 1e-8:
            scale = torch.tensor(1.0).reshape(1,1)

        pc = (pc - shift) / scale
        pcs[i] = pc
    return pcs


def predict(Seed, ckpt):
    if Seed is None:
        Seed = 777
    seed_all(int(Seed)) # Ensure Seed is an integer

    # Ensure args is accessible, provide a default if it's missing or not a Namespace
    # This is a defensive measure, as the error was about loading argparse.Namespace
    if not hasattr(ckpt, 'args') or not hasattr(ckpt['args'], 'model'):
        # This case should ideally not happen if the checkpoint is valid
        # but if it does, we need a fallback or error.
        # For now, let's assume 'args' and 'args.model' exist based on the error.
        print("Warning: Checkpoint 'args' or 'args.model' not found. Assuming 'gaussian'.")
        model_type = 'gaussian' 
        latent_dim = ckpt.get('latent_dim', 128) # A common default
        flexibility = ckpt.get('flexibility', 0.0) # A common default
    else:
        model_type = ckpt['args'].model
        latent_dim = ckpt['args'].latent_dim
        flexibility = ckpt['args'].flexibility


    if model_type == 'gaussian':
        # Pass necessary args to the constructor
        # We need to mock an args object if ckpt['args'] wasn't a full argparse.Namespace
        # or if some attributes are missing.
        mock_args = type('Args', (), {'latent_dim': latent_dim, 'hyper': getattr(ckpt.get('args', {}), 'hyper', None)})() # Add other required args
        model = GaussianVAE(mock_args).to(device)
    elif model_type == 'flow':
        mock_args = type('Args', (), {
            'latent_dim': latent_dim,
            'flow_depth': getattr(ckpt.get('args', {}), 'flow_depth', 10), # Example default
            'flow_hidden_dim': getattr(ckpt.get('args', {}), 'flow_hidden_dim', 256), # Example default
            'hyper': getattr(ckpt.get('args', {}), 'hyper', None)
        })()
        model = FlowVAE(mock_args).to(device)
    else:
        raise ValueError(f"Unknown model type: {model_type}")

    model.load_state_dict(ckpt['state_dict'])
    model.eval() # Set model to evaluation mode

    # Generate Point Clouds
    gen_pcs = []
    with torch.no_grad():
        z = torch.randn([1, latent_dim]).to(device)
        # The sample method might also depend on args from the checkpoint
        num_points_to_generate = getattr(ckpt.get('args', {}), 'num_points', 2048) # Default to 2048 if not in args
        x = model.sample(z, num_points_to_generate, flexibility=flexibility)
        gen_pcs.append(x.detach().cpu())
    
    gen_pcs_tensor = torch.cat(gen_pcs, dim=0)[:1] # Ensure we take only one point cloud
    gen_pcs_normalized = normalize_point_clouds(gen_pcs_tensor.clone(), mode="shape_bbox") # Use .clone() if normalize_point_clouds modifies inplace

    return gen_pcs_normalized[0]

def generate(seed, value):
    if value == "Airplane":
        ckpt = ckpt_airplane
    elif value == "Chair":
        ckpt = ckpt_chair
    else:
        # Default case or handle error
        # For now, defaulting to airplane if 'value' is unexpected
        print(f"Warning: Unknown model type '{value}'. Defaulting to Airplane.")
        ckpt = ckpt_airplane

    colors = (238, 75, 43) # RGB tuple for plotly
    
    # Ensure seed is not None and is an int for the predict function
    current_seed = seed
    if current_seed is None:
        current_seed = random.randint(0, 2**16 -1) # Generate a random seed if None
    current_seed = int(current_seed)

    points = predict(current_seed, ckpt)
    # num_points = points.shape[0] # Not used directly in fig

    fig = go.Figure(
        data=[
            go.Scatter3d(
                x=points[:, 0], y=points[:, 1], z=points[:, 2],
                mode='markers',
                marker=dict(size=2, color=f'rgb({colors[0]},{colors[1]},{colors[2]})') # plotly expects rgb string
            )
        ],
        layout=dict(
            scene=dict(
                xaxis=dict(visible=True, title='X', backgroundcolor="rgb(230, 230,230)", gridcolor="white", zerolinecolor="white"),
                yaxis=dict(visible=True, title='Y', backgroundcolor="rgb(230, 230,230)", gridcolor="white", zerolinecolor="white"),
                zaxis=dict(visible=True, title='Z', backgroundcolor="rgb(230, 230,230)", gridcolor="white", zerolinecolor="white"),
                aspectmode='data' # Ensures proportional axes
            ),
            margin=dict(l=0, r=0, b=0, t=40), # Adjust margins
            title=f"Generated {value} (Seed: {current_seed})"
        )
    )
    return fig

markdown = f'''
# Diffusion Probabilistic Models for 3D Point Cloud Generation

[The space demo for the CVPR 2021 paper "Diffusion Probabilistic Models for 3D Point Cloud Generation".](https://arxiv.org/abs/2103.01458)

[For the official implementation.](https://github.com/luost26/diffusion-point-cloud)
### Future Work based on interest
- Adding new models for new type objects
- New Customization 

It is running on **{device.upper()}**

---
**Note:** The `GEN_chair.pt` file must be manually placed in the root directory for the "Chair" model to work.
It is not downloaded automatically by this script.
Check the [original repository's instructions](https://github.com/luost26/diffusion-point-cloud#pretrained-models) for downloading checkpoints.
---
'''
with gr.Blocks(theme=gr.themes.Soft()) as demo:
    with gr.Column():
        with gr.Row():
            gr.Markdown(markdown)
        with gr.Row():
            seed_slider = gr.Slider(minimum=0, maximum=2**16 - 1, step=1, label='Seed (0 for random)', value=777) # Set initial value
            model_dropdown = gr.Dropdown(choices=["Airplane", "Chair"], label="Choose Model Type", value="Airplane") # Set initial value

        btn = gr.Button(value="Generate Point Cloud")
        point_cloud_plot = gr.Plot() # Changed variable name for clarity

    # demo.load(generate, [seed_slider, model_dropdown], point_cloud_plot) # demo.load usually runs on page load
    btn.click(generate, [seed_slider, model_dropdown], point_cloud_plot)

if __name__ == "__main__":
    # Ensure GEN_chair.pt exists if Chair model might be selected
    if not os.path.exists(chair_model_path):
        print(f"WARNING: Chair model checkpoint '{chair_model_path}' not found.")
        print(f"The 'Chair' option in the UI may not work unless this file is present.")
        print(f"Please download it from the original project repository and place it at '{chair_model_path}'.")
    
    demo.launch()