demo.py

from __future__ import print_function


from src.misc.config import cfg, cfg_from_file
from src.dataset import TextDataset
from src.trainer import condGANTrainer as trainer

import time
import random
import pprint
import numpy as np

import torch
import torchvision.transforms as transforms

from pathlib import Path
import streamlit as st


def gen_example(wordtoix, algo, text):
    """generate images from example sentences"""
    from nltk.tokenize import RegexpTokenizer

    data_dic = {}

    captions = []
    cap_lens = []

    sent = text.replace("\ufffd\ufffd", " ")
    tokenizer = RegexpTokenizer(r"\w+")
    tokens = tokenizer.tokenize(sent.lower())

    rev = []
    for t in tokens:
        t = t.encode("ascii", "ignore").decode("ascii")
        if len(t) > 0 and t in wordtoix:
            rev.append(wordtoix[t])
    captions.append(rev)
    cap_lens.append(len(rev))
    max_len = np.max(cap_lens)

    sorted_indices = np.argsort(cap_lens)[::-1]
    cap_lens = np.asarray(cap_lens)
    cap_lens = cap_lens[sorted_indices]
    cap_array = np.zeros((len(captions), max_len), dtype="int64")
    for i in range(len(captions)):
        idx = sorted_indices[i]
        cap = captions[idx]
        c_len = len(cap)
        cap_array[i, :c_len] = cap
    name = "output"
    key = name[(name.rfind("/") + 1) :]
    data_dic[key] = [cap_array, cap_lens, sorted_indices]
    algo.gen_example(data_dic)


# streamlit function


def center_element(type, text=None, img_path=None):
    """
    Function to center a streamlit element (text, image, etc)
    """
    if type == "image":
        col1, col2, col3 = st.columns([1, 2, 1])

    elif type == "text" or type == "heading":
        col1, col2, col3 = st.columns([1, 6, 1])

    elif type == "subheading":
        col1, col2, col3 = st.columns([1, 2, 1])

    elif type == "title":
        col1, col2, col3 = st.columns([1, 8, 1])

    with col1:
        st.write("")

    with col2:
        if type == "heading":
            st.header(text)

        elif type == "title":
            st.title(text)

        elif type == "image":
            st.image(img_path)

        elif type == "text":
            st.write(text)

        elif type == "subheading":
            st.subheader(text)

        # else:
        #     raise Exception("Unsupported input type")

    with col3:
        st.write("")


def demo_gan():

    cfg_from_file("eval_bird.yml")
    # print("Using config:")
    # pprint.pprint(cfg)
    cfg.CUDA = False
    manualSeed = 100
    random.seed(manualSeed)
    np.random.seed(manualSeed)
    torch.manual_seed(manualSeed)
    output_dir = "output/"
    split_dir = "test"
    bshuffle = True
    imsize = cfg.TREE.BASE_SIZE * (2 ** (cfg.TREE.BRANCH_NUM - 1))
    image_transform = transforms.Compose(
        [
            transforms.Resize(int(imsize * 76 / 64)),
            transforms.RandomCrop(imsize),
            transforms.RandomHorizontalFlip(),
        ]
    )
    st.cache(func=TextDataset, persist=True,ttl=10000)
    dataset = TextDataset(
        cfg.DATA_DIR, split_dir, base_size=cfg.TREE.BASE_SIZE, transform=image_transform
    )
    assert dataset
    dataloader = torch.utils.data.DataLoader(
        dataset,
        batch_size=cfg.TRAIN.BATCH_SIZE,
        drop_last=True,
        shuffle=bshuffle,
        num_workers=int(cfg.WORKERS),
    )

    # Define models and go to train/evaluate
    st.cache(
        func=trainer, persist=True, suppress_st_warning=True,ttl=10000
    )

    algo = trainer(output_dir, dataloader, dataset.n_words, dataset.ixtoword)

    st.title("Text To Image Generator ")



    st.subheader("Enter the description of the bird in the text box you like !!!")
    st.write(
        "**Example**: A yellow bird with red crown, black short beak and long tail"
    )
    st.markdown("**PS**: The synthesized birds might not even exist on earth ")
    st.markdown("#")

    user_input = st.text_input("Write the bird description below")
    st.markdown("---")

    if user_input:

        start_t = time.time()

        # generate images for customized captions
        gen_example(dataset.wordtoix, algo, text=user_input)
        end_t = time.time()
        print("Total time for training:", end_t - start_t)
        st.write(f"**Your input**: {user_input}")
        center_element(type="subheading", text="AttnGAN synthesized bird")
        st.text("")
        center_element(
            type="image", img_path="models/bird_AttnGAN2/output/0_s_0_g2.png"
        )

        center_element(type="subheading", text="The attention given for each word")
        st.image("models/bird_AttnGAN2/output/0_s_0_a1.png")

        st.markdown("---")
        with st.expander("Click to see the first stage images"):
            st.write("First stage image")
            st.image("models/bird_AttnGAN2/output/0_s_0_g1.png")
            st.write("First stage attention")
            st.image("models/bird_AttnGAN2/output/0_s_0_a0.png")


def attngan_explained():

    # center_element(type="heading", text="AttnGAN: Fine-Grained Text To Image Generation with Attentional Generative Adverserial Networks")
    st.header(
        "**AttnGAN**: Fine-Grained Text To Image Generation with Attentional Generative Adverserial Networks"
    )
    from attngan_explanation import attngan_explanation

    attngan_explanation()