MLOps Code Syntax Reference Hub | AI For Zero

MLOps Code Syntax Reference Hub

The developer's cheat sheet for critical syntax: data types, HTTP status, Git commands, and file permissions.

API Data Type Mapping Reference

Ensure seamless data transfer between Python backends (ML), JSON payloads, and SQL databases.

Concept	Python (ML/Pandas)	JSON (API Payload)	SQL (PostgreSQL/MySQL)
Text/String	`str`	`string`	`VARCHAR(255)`, `TEXT`
Integer	`int`, `np.int64`	`number` (integer)	`INT`, `BIGINT`
Floating Point	`float`, `np.float64`	`number` (float)	`FLOAT`, `DOUBLE PRECISION`
Boolean	`bool`	`boolean`	`BOOLEAN`
List / Array	`list`, `np.array`	`array`	`JSONB` (PostgreSQL), `VARCHAR` (Serialized)
Timestamp / Date	`datetime`	`string` (ISO 8601)	`TIMESTAMP WITH TIME ZONE`

Essential HTTP Status Codes for API Debugging

Quickly diagnose service health and failure causes when debugging MLOps pipelines.

Code	Category	Name	Common Cause (API/ML Context)
200	Success	OK	Standard successful inference or data retrieval.
201	Success	Created	Successfully logged a new model artifact or experiment result.
400	Client Error	Bad Request	Malformed JSON input payload (e.g., missing required field).
401	Client Error	Unauthorized	Missing or invalid API key/access token.
403	Client Error	Forbidden	Authorization failed; user lacks permission for the requested resource.
404	Client Error	Not Found	Endpoint URL or specific requested model version does not exist.
429	Client Error	Too Many Requests	Rate limit exceeded. Client must implement backoff strategy.
500	Server Error	Internal Server Error	Model crash or unhandled code exception on the server side.
503	Server Error	Service Unavailable	Server overloaded or container deployment still initializing.
504	Server Error	Gateway Timeout	Inference took longer than the allocated proxy timeout (needs model optimization).

Git Survival Guide: Conflict Resolution

Essential commands for cleaning up history and resolving merge conflicts in collaborative coding projects.

# 1. Check current status
git status

# 2. View conflicting files and differences
git diff

# 3. Use local changes, discarding remote changes
git checkout --ours <file-path>
git add <file-path>

# 4. Use remote changes, discarding local changes
git checkout --theirs <file-path>
git add <file-path>

# 5. Finish the merge after resolving conflicts manually
git commit -m "Merge resolved"

# 6. Abort an ongoing merge
git merge --abort

Linux File Permissions (chmod) Cheat Sheet

Quick reference for setting file execution and access rights in Docker containers and remote servers.

Symbolic Permission	Octal Code	Meaning
`---`	`000`	No permissions whatsoever.
`rwx`	`777`	Read, Write, and Execute for User, Group, and Others.
`rwxr-xr-x`	`755`	User can R, W, X. Group and Others can only R, X. (Standard directory permission)
`rw-r--r--`	`644`	User can R, W. Group and Others can only R. (Standard file permission)
`rwx------`	`700`	Owner has full access. No access for Group or Others. (Secure files)

**Octal Structure:** [User] [Group] [Others]. For example, `755` means User=`7` (R+W+X), Group=`5` (R+X), Others=`5` (R+X).

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