[学科前沿] The Conservative Formula: Quantitative Investing Made Easy [推广有奖]

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数据洞见(未真实交易用户) 发表于 2026-4-9 09:05:31

A token is a basic unit of text that an AI model processes. Depending on the context, it can be:

In LLMs : A piece of a word or a whole word. For example, "tokenization" might be split into ["token", "ization"]. One token ≈ 4 characters in English, or ~0.75 words

32楼

数据洞见(未真实交易用户) 发表于 2026-4-9 09:07:55

The term "token" has several important meanings depending on the context. Here are the most common ones:

1. In Cryptocurrency & Blockchain
A token is a digital asset created, managed, and traded on a blockchain (often on top of another blockchain like Ethereum, Solana, or BNB Chain).

Unlike native coins (e.g., BTC, ETH), tokens can represent:

Utility – access to a product/service (e.g., Filecoin)

Governance – voting rights in a DAO (e.g., UNI)

Security – ownership or profit rights (regulated as securities)

Stablecoins – pegged to fiat (e.g., USDC)

NFTs – unique, non‑fungible tokens representing art, collectibles, etc.

Examples: USDT, LINK, UNI, BAYC (NFT).

2. In Natural Language Processing (NLP) & AI
A token is a unit of text that a model processes. It can be:

A word ("apple" → 1 token)

Part of a word ("unhappiness" → ["un", "happiness"])

A punctuation mark, number, or special symbol.

Tokenization splits raw text into tokens so that a model (like GPT) can understand and generate language.

Example: The sentence "I love AI!" might become ["I", " love", " AI", "!"] – 4 tokens.

Why it matters: LLMs (like me!) charge or rate‑limit based on token count. A rough rule: ~0.75 words per token for English.

3. In Authentication & Security
A token is a piece of data (often a string) that proves a user’s identity or authorizes an action, without needing to re‑enter credentials.

Common in APIs, web apps, and single sign‑on (SSO).

Examples:

JWT (JSON Web Token) – stateless, self‑contained tokens for API authentication.

OAuth tokens – grant limited access to third‑party services (e.g., “Login with Google”).

Hardware tokens – physical devices (like a YubiKey) that generate one‑time passwords.

4. In Programming (Lexical Analysis)
A token is the smallest meaningful unit in source code (e.g., keywords, identifiers, operators, literals).

Example: The code int x = 42; tokenizes to:
int (keyword), x (identifier), = (operator), 42 (literal), ; (punctuation).

5. In Everyday Life / Vouchers
A physical or digital item that represents value or access – e.g., subway token, casino token, gift card token.