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#!/usr/bin/env python
# coding: utf-8
import random
import jax
import flax.linen as nn
from flax.training.common_utils import shard
from flax.jax_utils import replicate, unreplicate
from transformers.models.bart.modeling_flax_bart import *
from transformers import BartTokenizer, FlaxBartForConditionalGeneration
import io
import requests
from PIL import Image
import numpy as np
import matplotlib.pyplot as plt
import torch
import torchvision.transforms as T
import torchvision.transforms.functional as TF
from torchvision.transforms import InterpolationMode
from dalle_mini.vqgan_jax.modeling_flax_vqgan import VQModel
# TODO: set those args in a config file
OUTPUT_VOCAB_SIZE = 16384 + 1 # encoded image token space + 1 for bos
OUTPUT_LENGTH = 256 + 1 # number of encoded tokens + 1 for bos
BOS_TOKEN_ID = 16384
BASE_MODEL = 'facebook/bart-large-cnn'
class CustomFlaxBartModule(FlaxBartModule):
def setup(self):
# we keep shared to easily load pre-trained weights
self.shared = nn.Embed(
self.config.vocab_size,
self.config.d_model,
embedding_init=jax.nn.initializers.normal(self.config.init_std, self.dtype),
dtype=self.dtype,
)
# a separate embedding is used for the decoder
self.decoder_embed = nn.Embed(
OUTPUT_VOCAB_SIZE,
self.config.d_model,
embedding_init=jax.nn.initializers.normal(self.config.init_std, self.dtype),
dtype=self.dtype,
)
self.encoder = FlaxBartEncoder(self.config, dtype=self.dtype, embed_tokens=self.shared)
# the decoder has a different config
decoder_config = BartConfig(self.config.to_dict())
decoder_config.max_position_embeddings = OUTPUT_LENGTH
decoder_config.vocab_size = OUTPUT_VOCAB_SIZE
self.decoder = FlaxBartDecoder(decoder_config, dtype=self.dtype, embed_tokens=self.decoder_embed)
class CustomFlaxBartForConditionalGenerationModule(FlaxBartForConditionalGenerationModule):
def setup(self):
self.model = CustomFlaxBartModule(config=self.config, dtype=self.dtype)
self.lm_head = nn.Dense(
OUTPUT_VOCAB_SIZE,
use_bias=False,
dtype=self.dtype,
kernel_init=jax.nn.initializers.normal(self.config.init_std, self.dtype),
)
self.final_logits_bias = self.param("final_logits_bias", self.bias_init, (1, OUTPUT_VOCAB_SIZE))
class CustomFlaxBartForConditionalGeneration(FlaxBartForConditionalGeneration):
module_class = CustomFlaxBartForConditionalGenerationModule
import wandb
import os
os.environ["WANDB_SILENT"] = "true"
os.environ["WANDB_CONSOLE"] = "off"
# set id to None so our latest images don't get overwritten
id = None
run = wandb.init(id=id,
entity='wandb',
project="hf-flax-dalle-mini",
job_type="predictions",
resume="allow"
)
artifact = run.use_artifact('wandb/hf-flax-dalle-mini/model-4oh3u7ca:latest', type='bart_model')
artifact_dir = artifact.download()
# create our model
tokenizer = BartTokenizer.from_pretrained(BASE_MODEL)
model = CustomFlaxBartForConditionalGeneration.from_pretrained(artifact_dir)
model.config.force_bos_token_to_be_generated = False
model.config.forced_bos_token_id = None
model.config.forced_eos_token_id = None
vqgan = VQModel.from_pretrained("flax-community/vqgan_f16_16384")
def custom_to_pil(x):
x = np.clip(x, 0., 1.)
x = (255*x).astype(np.uint8)
x = Image.fromarray(x)
if not x.mode == "RGB":
x = x.convert("RGB")
return x
def generate(input, rng, params):
return model.generate(
**input,
max_length=257,
num_beams=1,
do_sample=True,
prng_key=rng,
eos_token_id=50000,
pad_token_id=50000,
params=params,
)
def get_images(indices, params):
return vqgan.decode_code(indices, params=params)
def plot_images(images):
fig = plt.figure(figsize=(40, 20))
columns = 4
rows = 2
plt.subplots_adjust(hspace=0, wspace=0)
for i in range(1, columns*rows +1):
fig.add_subplot(rows, columns, i)
plt.imshow(images[i-1])
plt.gca().axes.get_yaxis().set_visible(False)
plt.show()
def stack_reconstructions(images):
w, h = images[0].size[0], images[0].size[1]
img = Image.new("RGB", (len(images)*w, h))
for i, img_ in enumerate(images):
img.paste(img_, (i*w,0))
return img
p_generate = jax.pmap(generate, "batch")
p_get_images = jax.pmap(get_images, "batch")
bart_params = replicate(model.params)
vqgan_params = replicate(vqgan.params)
# ## CLIP Scoring
from transformers import CLIPProcessor, FlaxCLIPModel
clip = FlaxCLIPModel.from_pretrained("openai/clip-vit-base-patch32")
processor = CLIPProcessor.from_pretrained("openai/clip-vit-base-patch32")
def hallucinate(prompt, num_images=64):
prompt = [prompt] * jax.device_count()
inputs = tokenizer(prompt, return_tensors='jax', padding="max_length", truncation=True, max_length=128).data
inputs = shard(inputs)
all_images = []
for i in range(num_images // jax.device_count()):
key = random.randint(0, 1e7)
rng = jax.random.PRNGKey(key)
rngs = jax.random.split(rng, jax.local_device_count())
indices = p_generate(inputs, rngs, bart_params).sequences
indices = indices[:, :, 1:]
images = p_get_images(indices, vqgan_params)
images = np.squeeze(np.asarray(images), 1)
for image in images:
all_images.append(custom_to_pil(image))
return all_images
def clip_top_k(prompt, images, k=8):
inputs = processor(text=prompt, images=images, return_tensors="np", padding=True)
outputs = clip(**inputs)
logits = outputs.logits_per_text
scores = np.array(logits[0]).argsort()[-k:][::-1]
return [images[score] for score in scores]
# ## Log to wandb
from dalle_mini.helpers import captioned_strip
def log_to_wandb(prompts):
strips = []
for prompt in prompts:
print(f"Generating candidates for: {prompt}")
images = hallucinate(prompt, num_images=32)
selected = clip_top_k(prompt, images, k=8)
strip = captioned_strip(selected, prompt)
strips.append(wandb.Image(strip))
wandb.log({"images": strips})
prompts = prompts = [
"white snow covered mountain under blue sky during daytime",
"aerial view of beach during daytime",
"aerial view of beach at night",
"an armchair in the shape of an avocado",
"young woman riding her bike trough a forest",
"rice fields by the mediterranean coast",
"white houses on the hill of a greek coastline",
"illustration of a shark with a baby shark",
]
log_to_wandb(prompts)
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