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The dataset generation failed
Error code:   DatasetGenerationError
Exception:    CastError
Message:      Couldn't cast
text: string
metadata: struct<format: string, subject: string, agentic_expansion: string, quality_checked: bool, schema_ver (... 69 chars omitted)
  child 0, format: string
  child 1, subject: string
  child 2, agentic_expansion: string
  child 3, quality_checked: bool
  child 4, schema_version: string
  child 5, case_id: string
  child 6, difficulty: string
  child 7, deepening: string
messages: list<item: struct<role: string, content: string>>
  child 0, item: struct<role: string, content: string>
      child 0, role: string
      child 1, content: string
to
{'text': Value('string'), 'metadata': {'format': Value('string'), 'subject': Value('string'), 'agentic_expansion': Value('string'), 'quality_checked': Value('bool'), 'schema_version': Value('string')}}
because column names don't match
Traceback:    Traceback (most recent call last):
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1827, in _prepare_split_single
                  for key, table in generator:
                                    ^^^^^^^^^
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 613, in wrapped
                  for item in generator(*args, **kwargs):
                              ~~~~~~~~~^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 343, in _generate_tables
                  self._cast_table(pa_table, json_field_paths=json_field_paths),
                  ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 132, in _cast_table
                  pa_table = table_cast(pa_table, self.info.features.arrow_schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2378, in table_cast
                  return cast_table_to_schema(table, schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2306, in cast_table_to_schema
                  raise CastError(
                  ...<3 lines>...
                  )
              datasets.table.CastError: Couldn't cast
              text: string
              metadata: struct<format: string, subject: string, agentic_expansion: string, quality_checked: bool, schema_ver (... 69 chars omitted)
                child 0, format: string
                child 1, subject: string
                child 2, agentic_expansion: string
                child 3, quality_checked: bool
                child 4, schema_version: string
                child 5, case_id: string
                child 6, difficulty: string
                child 7, deepening: string
              messages: list<item: struct<role: string, content: string>>
                child 0, item: struct<role: string, content: string>
                    child 0, role: string
                    child 1, content: string
              to
              {'text': Value('string'), 'metadata': {'format': Value('string'), 'subject': Value('string'), 'agentic_expansion': Value('string'), 'quality_checked': Value('bool'), 'schema_version': Value('string')}}
              because column names don't match
              
              The above exception was the direct cause of the following exception:
              
              Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1369, in compute_config_parquet_and_info_response
                  parquet_operations, partial, estimated_dataset_info = stream_convert_to_parquet(
                                                                        ~~~~~~~~~~~~~~~~~~~~~~~~~^
                      builder, max_dataset_size_bytes=max_dataset_size_bytes
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  )
                  ^
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 948, in stream_convert_to_parquet
                  builder._prepare_split(split_generator=splits_generators[split], file_format="parquet")
                  ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1694, in _prepare_split
                  for job_id, done, content in self._prepare_split_single(
                                               ~~~~~~~~~~~~~~~~~~~~~~~~~~^
                      gen_kwargs=gen_kwargs, job_id=job_id, **_prepare_split_args
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  ):
                  ^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1880, in _prepare_split_single
                  raise DatasetGenerationError("An error occurred while generating the dataset") from e
              datasets.exceptions.DatasetGenerationError: An error occurred while generating the dataset

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text
string
metadata
dict
Subject: HTML coding Module: What HTML is Task: Explain HTML and its scope. Plan: Define HTML, identify its purpose, and distinguish it from CSS and JavaScript. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, accessibility obligations, and concrete a...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: How browsers process HTML Task: Explain the path from an HTML file to a visible webpage. Plan: Describe loading, parsing, DOM construction, resource discovery, styling, layout, and painting. Identify the user-facing outcome, the required information architecture, the semantic element for ea...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Document roots Task: Build a clean modern HTML document skeleton. Plan: Include document type, language, head metadata, page title, and body. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, accessibility obligations, and ...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Elements, tags, and attributes Task: Explain basic HTML syntax precisely. Plan: Define elements, opening and closing tags, void elements, attributes, and attribute values. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, a...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Nesting and hierarchy Task: Write correctly nested HTML and diagnose malformed nesting. Plan: Show the parent-child relationship and repair a crossed closing-tag error. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, acce...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Methodical coding workflow Task: Use a repeatable process to author a page without creating avoidable bugs. Plan: Move from purpose to outline, semantic structure, small implementations, and incremental testing. Identify the user-facing outcome, the required information architecture, the se...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Semantic structure Task: Choose elements based on meaning rather than appearance. Plan: Map common content roles to semantic elements and explain when div is appropriate. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, ac...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Headings and document outline Task: Create a logical heading hierarchy. Plan: Use one primary h1 for the page subject and use h2 through h6 by content hierarchy. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, accessibili...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Text and lists Task: Mark up common written content. Plan: Use paragraphs for prose and appropriate list elements for grouped items. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, accessibility obligations, and concrete ...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Links Task: Create useful and safe hyperlinks. Plan: Cover destinations, relative versus absolute URLs, descriptive text, fragments, and new-tab safety. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, accessibility obliga...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Images and media Task: Add image content accessibly and debug missing assets. Plan: Use img syntax, decide alt text by image purpose, and verify file paths. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, accessibility ob...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Accessible forms Task: Create an accessible, submit-ready contact form foundation. Plan: Pair labels and controls, use meaningful names and types, group related inputs, and provide errors clearly. Identify the user-facing outcome, the required information architecture, the semantic element ...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
Subject: HTML coding Module: Tables Task: Use tables for data rather than layout. Plan: Create a table with caption, headers, and data cells. Identify the user-facing outcome, the required information architecture, the semantic element for each content block, accessibility obligations, and concrete acceptance criteria ...
{ "format": "TEXT", "subject": "HTML coding and web development", "agentic_expansion": "eight-stage task execution and acceptance review", "quality_checked": true, "schema_version": "html-agentic-mixed-v1" }
End of preview.