Clean up unused variables in get_kvcache_metadata_buffer

[gameofdimension]

Removed unused variable assignments for tensor data types and buffer sizes.

Description

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[greptile-apps]

Greptile Summary

This PR removes two genuinely unused statements from get_kvcache_metadata_buffer in inference_config.py: a floating dtype ternary expression that was never assigned to a variable, and max_host_kv_buffer_size, a tuple that was computed but never referenced downstream. The cleanup is correct and has no functional impact.

Confidence Score: 5/5

Safe to merge — only dead code is removed with no behavioral change.

Both removed statements were provably unused: the dtype expression had no left-hand side assignment and was never referenced, and max_host_kv_buffer_size was assigned but never passed to KVCacheMetadata or used elsewhere. No logic paths are altered.

No files require special attention.

Important Files Changed

Filename	Overview
examples/hstu/configs/inference_config.py	Removed two dead-code statements in get_kvcache_metadata_buffer: a dtype ternary expression with no assignment, and an unused max_host_kv_buffer_size tuple variable. No functional change.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["get_kvcache_metadata_buffer(hstu_config, kvcache_config)"] --> B["Compute max_new_history_seqlen"]
    B --> C["Compute max_num_pages_per_seq"]
    C --> D["~~dtype ternary (removed)~~"]
    C --> E["~~max_host_kv_buffer_size (removed)~~"]
    C --> F["Allocate paged_indices_buffer"]
    F --> G["Allocate page_indptr_buffer"]
    G --> H["Allocate last_page_lens_buffer"]
    H --> I["Allocate batch_indices_buffer"]
    I --> J["Allocate position_buffer"]
    J --> K["Allocate total_history_offsets_buffer"]
    K --> L["Return KVCacheMetadata"]

    style D stroke-dasharray: 5 5,color:#999
    style E stroke-dasharray: 5 5,color:#999

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