[DOC] Update installation docs with missing dependencies (#18194)

[AshwiniBokka]

Fixes #18194

Based on user report, the installation documentation was missing:

1. System dependencies (zlib1g-dev, libxml2-dev)
2. Cython in Python dependencies
3. Post-build installation step (cd python && pip install -e .)

This PR adds these missing steps to from_source.rst:

• Added 'System Dependencies' section with Ubuntu commands
• Added Cython to the necessary dependencies
• Added 'Installing the Python Package' section after build

Changes:

• 24 insertions, 1 deletion
• Only 1 file changed (docs/install/from_source.rst)

This addresses all 4 issues reported by the user in #18194.

[gemini-code-assist]

Summary of Changes

Hello @AshwiniBokka, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the installation documentation for building from source, addressing a user report by incorporating crucial missing steps. The changes enhance the clarity and completeness of the installation guide by adding system-level dependencies, an additional Python dependency (Cython), and the final post-build installation command for the Python package, ensuring a smoother setup process for users.

Highlights

• System Dependencies: Added a new section detailing required system libraries (zlib1g-dev, libxml2-dev) for Ubuntu/Debian systems to the installation guide.
• Python Dependencies: Included Cython in the list of necessary Python dependencies for building from source.
• Post-Build Installation: Introduced a new section guiding users to install the Python package after a successful build using 'cd python && pip install -e .'.

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Changelog

• docs/install/from_source.rst
  • Added a 'System Dependencies' section with 'apt' commands for 'zlib1g-dev' and 'libxml2-dev'.
  • Updated the 'Necessary dependencies' list to include 'cython'.
  • Added an 'Installing the Python Package' section with instructions for 'pip install -e .'.

Activity

• Initiated to fix issue [Bug] the latest doc about installing tvm from source code is not complete. #18194, which reported missing installation steps.
• Implemented changes based on a user report to improve documentation accuracy.
• Modified a single file, 'docs/install/from_source.rst', with 24 insertions and 1 deletion.

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[gemini-code-assist]

Code Review

The pull request correctly identifies several missing dependencies and steps in the TVM installation documentation. Specifically, adding cython and the required system libraries (zlib1g-dev, libxml2-dev) is a valuable improvement for users not using the Conda-based setup. However, the placement of the "System Dependencies" section is logically inconsistent with the document's flow, as these libraries are required for the build process (Step 3) rather than being "Extra Python Dependencies" (Step 5). Additionally, the new "Installing the Python Package" section is redundant with instructions already present at the end of Step 3. The section headers also introduce an inconsistency in the document's heading hierarchy.

[yongwww]

@tvm-bot run