To extract tables from any documents, set the strategy parameter to hi_res for both methods below.

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Method 1: Using partition_pdf

To extract the tables from PDF files using the partition_pdf, set the infer_table_structure parameter to True and strategy parameter to hi_res. Usage 
from unstructured.partition.pdf import partition_pdf

fname = "example-docs/layout-parser-paper.pdf"

elements = partition_pdf(filename=fname,
                         infer_table_structure=True,
                         strategy='hi_res',
           )

tables = [el for el in elements if el.category == "Table"]

print(tables[0].text)
print(tables[0].metadata.text_as_html)

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Method 2: Using Auto Partition or Unstructured API

By default, table extraction from all file types is enabled. To extract tables from PDFs and images using Auto Partition or Unstructured API parameters simply set strategy parameter to hi_res. Usage: Auto Partition 
from unstructured.partition.auto import partition

filename = "example-docs/layout-parser-paper.pdf"

elements = partition(filename=filename,
                     strategy='hi_res',
           )

tables = [el for el in elements if el.category == "Table"]

print(tables[0].text)
print(tables[0].metadata.text_as_html)
Usage: API Parameters 
curl -X 'POST' \
    'https://api.unstructured.io/general/v0/general' \
    -H 'accept: application/json' \
    -H 'Content-Type: multipart/form-data' \
    -F 'files=@sample-docs/layout-parser-paper-with-table.jpg' \
    -F 'strategy=hi_res' \
    | jq -C . | less -R