Package: gemini-torch
GeminiThe open source implementation of Gemini, the model that will "eclipse ChatGPT", it seems to work by directly taking in all modalities all at once into a transformer with special decoders for text or img generation!Join the Agora discord channel to help with the implementation!andHere is the project board:The input sequences for Gemini consist of texts, audio, images, and videos. These inputs are transformed into tokens, which are then processed by a transformer. Subsequently, conditional decoding takes place to generate image outputs. Interestingly, the architecture of Gemini bears resemblance to Fuyu's architecture but is expanded to encompass multiple modalities. Instead of utilizing a visual transformer (vit) encoder, Gemini simply feeds image embeddings directly into the transformer. For Gemini, the token inputs will likely be indicated by special modality tokens such as [IMG],, [AUDIO], or . Codi, a component of Gemini, also employs conditional generation and makes use of the tokenized outputs. To implement this model effectively, I intend to initially focus on the image embeddings to ensure their smooth integration. Subsequently, I will proceed with incorporating audio embeddings and then video embeddings.Installpip3 install gemini-torchUsageGemini Transformer UsageBase transformerMulti Grouped Query Attn / flash attnropealibixposqk normno pos embedskv cacheimporttorchfromgemini_torch.modelimportGemini# Initialize model with smaller dimensionsmodel=Gemini(num_tokens=50432,max_seq_len=4096,# Reduced from 8192dim=1280,# Reduced from 2560depth=16,# Reduced from 32dim_head=64,# Reduced from 128heads=12,# Reduced from 24use_abs_pos_emb=False,attn_flash=True,attn_kv_heads=2,qk_norm=True,attn_qk_norm=True,attn_qk_norm_dim_scale=True,)# Text shape: [batch, seq_len, dim]text=torch.randint(0,50432,(1,4096))# Reduced seq_len from 8192# Apply model to texty=model(text,)# Output shape: [batch, seq_len, dim]print(y)Full Multi-Modal GeminiProcesses images and audio through a series of reshapesReady to train for production grade usageHyper optimized with flash attention, qk norm, and other methodsimporttorchfromgemini_torch.modelimportGemini# Initialize model with smaller dimensionsmodel=Gemini(num_tokens=10000,# Reduced from 50432max_seq_len=1024,# Reduced from 4096dim=320,# Reduced from 1280depth=8,# Reduced from 16dim_head=32,# Reduced from 64heads=6,# Reduced from 12use_abs_pos_emb=False,attn_flash=True,attn_kv_heads=2,qk_norm=True,attn_qk_norm=True,attn_qk_norm_dim_scale=True,post_fusion_norm=True,post_modal_transform_norm=True,)# Text shape: [batch, seq_len, dim]text=torch.randint(0,10000,(1,1024))# Reduced seq_len from 4096# Img shape: [batch, channels, height, width]img=torch.randn(1,3,64,64)# Reduced height and width from 128# Audio shape: [batch, audio_seq_len, dim]audio=torch.randn(1,32)# Reduced audio_seq_len from 64# Apply model to text and imgy,_=model(text=text,img=img,audio=audio)# Output shape: [batch, seq_len, dim]print(y)print(y.shape)# After much trainingmodel.eval()text=tokenize(texts)logits=model(text)text=detokenize(logits)TokenizerSentencepiece, tokenizerWe're using the same tokenizer as LLAMA with special tokens denoting the beginning and end of the multi modality tokens.Does not fully process img, audio, or videos now we need help on thatfromgemini_torch.tokenizerimportMultimodalSentencePieceTokenizer# Example usagetokenizer_name="hf-internal-testing/llama-tokenizer"tokenizer=MultimodalSentencePieceTokenizer(tokenizer_name=tokenizer_name)# Encoding and decoding examplesencoded_audio=tokenizer.encode("Audio description",modality="audio")decoded_audio=tokenizer.decode(encoded_audio)print("Encoded audio:",encoded_audio)print("Decoded audio:",decoded_audio)ReferencesCombine Reinforcment learning with modular pretrained transformer, multi-modal capabilities, image, audio,self improving mechanisms like robocatPPO? or MPOget good at backtracking and exploring alternative pathsspeculative decodingAlgorithm of ThoughtsRLHFGemini ReportGemini Landing PageTodoCheck out the project board for more todosImplement the img feature embedder and align imgs with text and pass into transformer:Gemini models are trained to accommodate textual input interleaved with a wide variety of audio and visual inputs, such as natural images, charts, screenshots, PDFs, and videos, and they can produce text and image outputs (see Figure 2). The visual encoding of Gemini models is inspired by our own foundational work on Flamingo (Alayrac et al., 2022), CoCa (Yu et al., 2022a), and PaLI (Chen et al., 2022), with the important distinction that the models are multimodal from the beginning and can natively output images using discrete image tokens (Ramesh et al., 2021; Yu et al., 2022b).Implement the audio processing using USM by Google:In addition, Gemini can directly ingest audio signals at 16kHz from Universal Speech Model (USM) (Zhang et al., 2023) features. This enables the model to capture nuances that are typically lost when the audio is naively mapped to a text input (for example, see audio understanding demo on the website).Video Processing Technique: "
Video understanding is accomplished by encoding the video as a sequence of frames in the large
context window. Video frames or images can be interleaved naturally with text or audio as part of the
model input"Prompting Technique:We find Gemini Ultra achieves highest accuracy when used in combination with a chain-of-thought prompting approach (Wei et al., 2022) that accounts for model uncertainty. The model produces a chain of thought with k samples, for example 8 or 32. If there is a consensus above a preset threshold (selected based on the validation split), it selects this answer, otherwise it reverts to a greedy sample based on maximum likelihood choice without chain of thought. We refer the reader to appendix for a detailed breakdown of how this approach compares with only chain-of-thought prompting or only greedy sampling.Train a 1.8B + 3.25 Model:Nano-1 and Nano-2 model sizes are only 1.8B and 3.25B parameters respectively. Despite their size, they show exceptionally strong performance on factuality, i.e. retrieval-related tasks, and significant performance on reasoning, STEM, coding, multimodal and