esm2_t33_650M_UR50D
ModelFreefill-mask model by undefined. 17,26,250 downloads.
Capabilities6 decomposed
protein-sequence-masked-token-prediction
Medium confidencePredicts masked amino acid tokens in protein sequences using a 33-layer transformer encoder trained on 250M unlabeled protein sequences from UniRef50. The model uses bidirectional attention to infer missing residues by learning contextual patterns from evolutionary and structural relationships encoded in the training corpus. Outputs probability distributions over the 20 standard amino acids plus special tokens for each masked position.
Trained on 250M unlabeled UniRef50 sequences with 33 transformer layers (650M parameters) using masked language modeling, capturing evolutionary and functional relationships at scale — larger and more diverse training corpus than earlier ESM-1b (1.2B sequences, 33 layers) and competitive with AlphaFold2's sequence understanding but optimized specifically for token-level prediction rather than structure
Outperforms ProtBERT and ESM-1b on masked token prediction accuracy due to larger model capacity and training data, while remaining computationally efficient enough for real-time inference on modest hardware compared to full structure prediction models like OmegaFold
protein-sequence-embedding-generation
Medium confidenceExtracts dense vector representations (embeddings) from protein sequences by passing them through the 33-layer transformer encoder and extracting hidden states at specified layers. These embeddings capture semantic and functional properties of proteins and can be used as input features for downstream ML tasks like classification, clustering, or similarity search. Supports per-token embeddings (one vector per amino acid) or sequence-level pooling (single vector per protein).
Provides 1280-dimensional embeddings from a 650M-parameter transformer trained on 250M diverse protein sequences, capturing both sequence-level and structural patterns — embeddings are shown to correlate with protein function and structure better than sequence-based features alone, and the model's scale enables transfer learning to low-data protein engineering tasks
Produces more functionally-informative embeddings than ProtBERT (due to larger training data and model size) and more computationally efficient than structure-based embeddings from AlphaFold2 while maintaining competitive performance on downstream tasks like remote homology detection
batch-protein-sequence-inference
Medium confidenceProcesses multiple protein sequences in parallel through the transformer encoder using batching and dynamic padding to maximize GPU utilization. Automatically handles variable-length sequences by padding to the longest sequence in the batch and masking padded positions during attention computation. Supports both CPU and GPU inference with automatic device selection and memory-efficient gradient checkpointing for large batches.
Implements dynamic padding with attention masking and supports gradient checkpointing for memory-efficient batching — the model's 33-layer depth makes checkpointing particularly valuable, reducing peak memory by ~50% at the cost of ~20% inference latency, enabling batch sizes 2-3x larger than naive batching
More memory-efficient than naive transformer batching due to gradient checkpointing support, and faster than sequential inference by 10-50x depending on batch size and hardware, though slower per-sequence than smaller models like ProtBERT due to the larger 650M parameter count
protein-sequence-tokenization-and-encoding
Medium confidenceConverts raw protein sequences (strings of amino acid letters) into numerical token IDs compatible with the transformer model using a learned vocabulary of 33 tokens (20 standard amino acids + special tokens for padding, masking, unknown, and start/end markers). Handles edge cases like lowercase letters, non-standard amino acids (X, U, O), and sequence length constraints by truncating or padding to a configurable maximum length (default 1024 tokens).
Uses a 33-token vocabulary specifically designed for protein sequences (20 amino acids + 13 special tokens) with learned token embeddings from the 250M-sequence training corpus — the vocabulary is optimized for evolutionary and functional signal rather than generic subword tokenization, enabling more efficient representation of protein patterns
More protein-specific than generic BPE tokenizers used in ProtBERT, and simpler than multi-sequence alignment tokenization used in MSA-Transformer, making it faster to tokenize while maintaining competitive downstream task performance
masked-position-prediction-with-context
Medium confidencePredicts amino acid identities at masked positions by computing logits over the 20 standard amino acids using the transformer's contextual understanding of surrounding residues. The model learns to infer missing positions by leveraging evolutionary patterns, structural constraints, and functional requirements encoded in the 250M-sequence training corpus. Outputs ranked predictions with confidence scores (softmax probabilities) for each masked position.
Leverages 33 transformer layers trained on 250M diverse protein sequences to capture multi-scale evolutionary and functional patterns — the model learns implicit structural constraints and functional requirements without explicit 3D structure input, enabling predictions that correlate with experimentally-validated amino acid substitutions better than simple conservation-based methods
More accurate than position-specific scoring matrices (PSSMs) or conservation-based methods for predicting functional amino acids, and faster than structure-based design tools like Rosetta while maintaining competitive performance on protein engineering benchmarks
transfer-learning-fine-tuning-on-custom-datasets
Medium confidenceEnables fine-tuning of the pre-trained ESM2 model on custom protein datasets for domain-specific tasks (e.g., predicting protein properties, classifying protein families, or optimizing sequences for specific functions). The model's 33-layer transformer encoder can be partially or fully fine-tuned using standard PyTorch/TensorFlow training loops, with support for gradient accumulation, mixed precision training, and learning rate scheduling to optimize convergence on limited labeled data.
The pre-trained 650M-parameter model provides strong initialization for protein understanding, enabling effective fine-tuning with as few as 100-500 labeled examples — the model's 33-layer depth and 250M-sequence training corpus encode rich protein knowledge that transfers well to downstream tasks, reducing data requirements compared to training from scratch
Requires 10-100x fewer labeled examples than training a protein model from scratch, and outperforms shallow baselines (logistic regression on sequence features) by 20-40% on typical protein property prediction tasks, though full fine-tuning is more computationally expensive than parameter-efficient methods like LoRA
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
Related Artifactssharing capabilities
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Best For
- ✓computational biologists performing protein sequence analysis and validation
- ✓protein engineering teams designing variants with predicted functional properties
- ✓researchers building protein language models and fine-tuning on domain-specific tasks
- ✓bioinformaticians integrating protein understanding into ML pipelines
- ✓ML engineers building protein property prediction pipelines
- ✓researchers performing protein clustering and functional annotation
- ✓teams implementing protein similarity search and recommendation systems
- ✓bioinformaticians integrating protein understanding into multi-modal models
Known Limitations
- ⚠Trained exclusively on natural protein sequences — may not generalize well to highly engineered or synthetic proteins with non-standard amino acids
- ⚠Requires input sequences in standard FASTA format with single-letter amino acid codes; cannot process post-translational modifications or non-canonical residues
- ⚠Context window limited to sequence length — long proteins (>1024 residues) may lose long-range structural context in predictions
- ⚠No built-in uncertainty quantification — outputs probabilities but not confidence intervals or epistemic uncertainty estimates
- ⚠Inference latency scales quadratically with sequence length due to transformer self-attention complexity
- ⚠Embeddings are task-agnostic and not optimized for specific downstream tasks — may require fine-tuning for best performance
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facebook/esm2_t33_650M_UR50D — a fill-mask model on HuggingFace with 17,26,250 downloads
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