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{
"cells": [
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"from typing import List, Union\n",
"\n",
"import torch\n",
"from transformers import AutoModel"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Load model"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"model = AutoModel.from_pretrained(\"InstaDeepAI/segment_enformer\", trust_remote_code=True)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Define useful functions"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"def encode_sequences(sequences: Union[str, List[str]]) -> torch.Tensor:\n",
" \"\"\"\n",
" One-hot encode a DNA sequence or a batch of DNA sequences.\n",
"\n",
" Args:\n",
" sequences (Union[str, List[str]]): Either a DNA sequence or a list of DNA sequences\n",
"\n",
" Returns:\n",
" torch.Tensor: One-hot encoded\n",
" - If `sequences` is just one sequence (str), output shape is (196608, 4)\n",
" - If `sequences` is a list of sequences, output shape is (num_sequences, 196608, 4)\n",
" \n",
" \"\"\"\n",
" one_hot_map = {\n",
" 'a': torch.tensor([1., 0., 0., 0.]),\n",
" 'c': torch.tensor([0., 1., 0., 0.]),\n",
" 'g': torch.tensor([0., 0., 1., 0.]),\n",
" 't': torch.tensor([0., 0., 0., 1.]),\n",
" 'n': torch.tensor([0., 0., 0., 0.]),\n",
" 'A': torch.tensor([1., 0., 0., 0.]),\n",
" 'C': torch.tensor([0., 1., 0., 0.]),\n",
" 'G': torch.tensor([0., 0., 1., 0.]),\n",
" 'T': torch.tensor([0., 0., 0., 1.]),\n",
" 'N': torch.tensor([0., 0., 0., 0.])\n",
" }\n",
"\n",
" def encode_sequence(seq_str):\n",
" one_hot_list = []\n",
" for char in seq_str:\n",
" one_hot_vector = one_hot_map.get(char, torch.tensor([0.25, 0.25, 0.25, 0.25]))\n",
" one_hot_list.append(one_hot_vector)\n",
" return torch.stack(one_hot_list)\n",
"\n",
" if isinstance(sequences, list):\n",
" return torch.stack([encode_sequence(seq) for seq in sequences])\n",
" else:\n",
" return encode_sequence(sequences)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Inference example"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"sequences = [\"A\"*196608, \"G\"*196608]\n",
"one_hot_encoding = encode_sequences(sequences)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"preds = model(one_hot_encoding)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"print(preds['logits'])"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "genomics-research-env",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.11.10"
}
},
"nbformat": 4,
"nbformat_minor": 2
}
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