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  2. pandas (software) - Wikipedia

    en.wikipedia.org/wiki/Pandas_(software)

    [4]: 114 A DataFrame is a 2-dimensional data structure of rows and columns, similar to a spreadsheet, and analogous to a Python dictionary mapping column names (keys) to Series (values), with each Series sharing an index. [4]: 115 DataFrames can be concatenated together or "merged" on columns or indices in a manner similar to joins in SQL.

  3. Comma-separated values - Wikipedia

    en.wikipedia.org/wiki/Comma-separated_values

    Comma-separated values (CSV) is a text file format that uses commas to separate values, and newlines to separate records. A CSV file stores tabular data (numbers and text) in plain text, where each line of the file typically represents one data record.

  4. Shift operator - Wikipedia

    en.wikipedia.org/wiki/Shift_operator

    The one-sided shift S acting on ⁠ ⁠ is a proper isometry with range equal to all vectors which vanish in the first coordinate. The operator S is a compression of T −1 , in the sense that T − 1 y = S x for each x ∈ ℓ 2 ( N ) , {\displaystyle T^{-1}y=Sx{\text{ for each }}x\in \ell ^{2}(\mathbb {N} ),} where y is the vector in ⁠ ℓ ...

  5. Here’s where the weather could disrupt New Year’s Eve ...

    www.aol.com/where-weather-could-disrupt-eve...

    The 2025 New Year’s Eve numerals are seen on display in Times Square on December 18 in New York City. (Michael M. Santiago/Getty Images)

  6. LR parser - Wikipedia

    en.wikipedia.org/wiki/LR_parser

    The columns for nonterminals are copied to the goto table. The columns for the terminals are copied to the action table as shift actions. An extra column for '$' (end of input) is added to the action table. An acc action is added to the '$' column for each item set that contains an item of the form S → w • eof.

  7. Try these four expert-approved treat-delivery methods to keep ...

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    “It’s not what you feed, it’s the way you feed it,” explains Burton. “Your treat delivery technique can have a powerful impact on the outcome of your training.”

  8. Blake Lively's Sexual Harassment Complaint: Legal Expert ...

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    Blake Lively could be headed to trial over the claims made in her sexual harassment complaint against Justin Baldoni, a legal expert tells PEOPLE.. According to Gregory Doll, who is a partner at ...

  9. Feature scaling - Wikipedia

    en.wikipedia.org/wiki/Feature_scaling

    Also known as min-max scaling or min-max normalization, rescaling is the simplest method and consists in rescaling the range of features to scale the range in [0, 1] or [−1, 1]. Selecting the target range depends on the nature of the data. The general formula for a min-max of [0, 1] is given as: [3]