v0.5.1

What's Changed

• Add clone_inner() to Ex structs by @philss in #473
• Add boolean type to Series.in/2 by @miXwui in #475
• Add filter_with/2 for Polars LazyFrame backend by @philss in #476
• Add binary dtype to Series.in/2 by @Jhonatannunessilva in #477
• Add Series.in/2 tests for boolean series by @miXwui in #478
• Add LazyFrame implementation for arrange_with/2, distinct/3, mutate_with/2 and summarise_with/2 by @philss in #479
• Add Series.day_of_week/1 by @sasikumar87 in #480
• Allow Series.fill_missing/2 to receive infinity and neg_infinity values by @Jhonatannunessilva in #484
• Simplify release workflow with a new action by @philss in #485
• Change GitHub Action that installs Rust by @philss in #486
• Allow Series.fill_missing/2 to receive date and datetime values by @Jhonatannunessilva in #483
• Support time dtype by @sasikumar87 in #487
• Add some LazyFrame functions - part III by @philss in #488
• Allow Series.fill_missing/2 to receive binary values by @Jhonatannunessilva in #489
• Simplify df_describe with as_deref() by @philss in #490
• Add LazyFrame version of "join" by @philss in #491
• Add LazyFrame concat of rows and columns by @philss in #492
• Add LazyFrame version of to_parquet/3 by @philss in #496
• Raise for unavailable LazyFrame functions explicitly by @philss in #497
• Allow Explorer.PolarsBackend.Series.pow/2 on (series, series) by @nallwhy in #440
• Fix pow of (series, series) when there is nil by @philss in #500
• Allow Series.from_list/2 to receive nan, infinity and neg_infinity values by @Jhonatannunessilva in #495
• Implement the Deref trait for our Ex* structs in order to abstract usage by @philss in #501
• fixed typo and clarified sentence for macro note by @a-alhusaini in #505
• Add Series.to_date/1 and Series.to_time/1 for datetime series by @sasikumar87 in #502
• Bump nightly version in order to fix the build by @philss in #509
• Prepare changelog for v0.5.1 by @philss in #508

New Contributors

• @a-alhusaini made their first contribution in #505

Full Changelog: v0.5.0...v0.5.1
Official Changelog: https://hexdocs.pm/explorer/changelog.html#v0-5-1-2023-02-17

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v0.5.0

Added

• Add DataFrame.describe/2 to gather some statistics from a dataframe.

• Add Series.nil_count/1 to count nil values.

• Add Series.in/2 to check if a given value is inside a series.

• Add Series float predicates: is_finite/1, is_infinite/1 and is_nan/1.

• Add Series string functions: contains/2, trim/1, trim_leading/1, trim_trailing/1,
  upcase/1 and downcase/1.

• Enable slicing of lazy frames (LazyFrame).

• Add IO operations "from/load" to the lazy frame implementation.

• Add support for the :lazy option in the DataFrame.new/2 function.

• Add Series float rounding methods: round/2, floor/1 and ceil/1.

• Add support for precompiling to Linux running on RISCV CPUs.

• Add support for precompiling to Linux - with musl - running on AARCH64 computers.

• Allow DataFrame.new/1 to receive the :dtypes option.

• Accept :nan as an option for Series.fill_missing/2 with float series.

• Add basic support for the categorical dtype - the :category dtype.

• Add Series.categories/1 to return categories from a categorical series.

• Add Series.categorise/2 to categorise a series of integers using predefined categories.

• Add Series.replace/2 to replace the contents of a series.

• Support selecting columns with unusual names (like with spaces) inside Explorer.Query
  with col/1.

  The usage is like this:

  Explorer.DataFrame.filter(df, col("my col") > 42)

Fixed

• Fix DataFrame.mutate/2 using a boolean scalar value.
• Stop leaking UInt32 series to Elixir.
• Cast numeric columns to our supported dtypes after IO read.
  This fix is only applied for the eager implementation for now.

Changed

• Rename Series.bintype/1 to Series.iotype/1.

Pull requests made for this release

• Add DF describe by @cristineguadelupe in #444
• Fix mutate using a boolean scalar value by @miXwui in #445
• Add s_nil_count by @cristineguadelupe in #446
• Adds Series.in/2 function by @kimjoaoun in #420
• Add Series float predicates: is_finite/1, is_infinite/1, is_nan/1 by @sasikumar87 in #448
• Add Series string functions by @cigrainger in #449
• Enables the slicing of LazyFrames by @kimjoaoun in #450
• Add IO operations "from/load" to the LazyFrame implementation by @philss in #451
• Add Series float rounding methods: round/2, floor/1 and ceil/1 by @sasikumar87 in #455
• Percentiles for describe by @cristineguadelupe in #454
• Add support for RISCV and Linux on M1/2 with musl by @philss in #456
• Update polars to v0.26.1 by @philss in #459
• Allow DataFrame.new/1 to receive the dtypes option by @Jhonatannunessilva in #460
• Add basic support for categorical dtype by @philss in #464
• Add Series.categories/1 by @philss in #465
• Add Series.categorise/2 by @philss in #466
• Normalize numeric dtypes when loading/reading from IO by @philss in #470
• Prepare release v0.5.0 by @philss in #469

New Contributors

• @cristineguadelupe made their first contribution in #444
• @miXwui made their first contribution in #445
• @Jhonatannunessilva made their first contribution in #460

The official Changelog: https://github.com/elixir-nx/explorer/blob/main/CHANGELOG.md#v050---2023-01-12
Full diff of this version: v0.4.0...v0.5.0

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v0.4.0

This is an exciting release with a lot of features, a bunch of changes and some fixes.
Happy Hacking!

Added

• Add Series.quotient/2 and Series.remainder/2 to work with integer division.

• Add Series.bintype/1 to return the underlying representation type.

• Allow series on both sides of binary operations, like: add(series, 1)
  and add(1, series).

• Allow comparison, concat and coalesce operations on "(series, lazy series)".

• Add lazy version of Series.sample/3 and Series.size/1.

• Add support for Arrow IPC Stream files.

• Add Explorer.Query and the macros that allow a simplified query API.
  This is a huge improvement to some of the main functions, and allow refering to
  columns as they were variables.

  Before this change we would need to write a filter like this:

  Explorer.DataFrame.filter_with(df, &Explorer.Series.greater(&1["col1"], 42))

  But now it's also possible to write this operation like this:

  Explorer.DataFrame.filter(df, col1 > 42)

  This operation is going to use filter_with/2 underneath, which means that
  is going to use lazy series and compute the results at once.
  Notice that is mandatory to "require" the DataFrame module, since these operations
  are implemented as macros.

  The following new macros were added:

  • filter/2
  • mutate/2
  • summarise/2
  • arrange/2

  They substitute older versions that did not accept the new query syntax.

• Add DataFrame.put/3 to enable adding or replacing columns in a eager manner.
  This works similar to the previous version of mutate/2.

• Add Series.select/3 operation that enables selecting a value
  from two series based on a predicate.

• Add "dump" and "load" functions to IO operations. They are useful to load
  or dump dataframes from/to memory.

• Add Series.to_iovec/2 and Series.to_binary/1. They return the underlying
  representation of series as binary. The first one returns a list of binaries,
  possibly with one element if the series is contiguous in memory. The second one
  returns a single binary representing the series.

• Add Series.shift/2 that shifts the series by an offset with nil values.

• Rename Series.fetch!/2 and Series.take_every/2 to Series.at/2
  and Series.at_every/2.

• Add DataFrame.discard/2 to drop columns. This is the opposite of select/2.

• Implement Nx.LazyContainer for Explorer.DataFrame and Explorer.Series
  so data can be passed into Nx.

• Add Series.not/1 that negates values in a boolean series.

• Add the :binary dtype for Series. This enables the usage of arbitrary binaries.

Changed

• Change DataFrame's to_* functions to return only :ok.
• Change series inspect to resamble the dataframe inspect with the backend name.
• Rename Series.var/1 to Series.variance/1
• Rename Series.std/1 to Series.standard_deviation/1
• Rename Series.count/2 to Series.frequencies/1 and add a new Series.count/1
  that returns the size of an "eager" series, or the count of members in a group
  for a lazy series.
  In case there is no groups, it calculates the size of the dataframe.
• Change the option to control direction in Series.sort/2 and Series.argsort/2.
  Instead of a boolean, now we have a new option called :direction that accepts
  :asc or :desc.

Fixed

• Fix the following DataFrame functions to work with groups:
  • filter_with/2
  • head/2
  • tail/2
  • slice/2
  • slice/3
  • pivot_longer/3
  • pivot_wider/4
  • concat_rows/1
  • concat_columns/1
• Improve the documentation of functions that behave differently with groups.
• Fix arrange_with/2 to use "group by" stable, making results more predictable.
• Add nil as a possible return value of aggregations.
• Fix the behaviour of Series.sort/2 and Series.argsort/2 to add nils at the
  front when direction is descending, or at the back when the direction is ascending.
  This also adds an option to control this behaviour.

Removed

• Remove support for NDJSON read and write for ARM 32 bits targets.
  This is due to a limitation of a dependency of Polars.

New Contributors

• @Ian-GL made their first contribution in #352
• @pgeraghty made their first contribution in #361
• @thbar made their first contribution in #362
• @nallwhy made their first contribution in #366
• @xaviRodri made their first contribution in #365
• @tmr08c made their first contribution in #388
• @linusdm made their first contribution in #412
• @thmsmlr made their first contribution in #418
• @sasikumar87 made their first contribution in #433

We also had @joshuataylor and @Benjamin-Philip contributing to this release.

Full Changelog: v0.3.1...v0.4.0
Official Changelog: https://hexdocs.pm/explorer/changelog.html

Checksums

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v0.3.1

Fixed

• Define multiply inside *_with operations.
• Fix column types in several operations, such as n_distinct.

v0.3.0

Added

• Add DataFrame.concat_columns/1 and DataFrame.concat_columns/2 for horizontally stacking
  dataframes.

• Add compression as an option to write parquet files.

• Add count metadata to DataFrame table reader.

• Add DataFrame.filter_with/2, DataFrame.summarise_with/2, DataFrame.mutate_with/2 and
  DataFrame.arrange_with/2. They all accept a DataFrame and a function, and they all work with
  a new concept called "lazy series".

  Lazy Series is an opaque representation of a series that can be
  used to perform complex operations without pulling data from the series. This is faster than
  using masks. There is no big difference from the API perspective compared to the functions that were
  accepting callbacks before (eg. filter/2 and the new filter_with/2), with the exception being
  DataFrame.summarise_with/2 that now accepts a lot more operations.

Changed

• Bump version requirement of the table dependency to ~> 0.1.2, and raise for non-tabular values.
• Normalize how columns are handled. This changes some functions to accept one column or
  a list of columns, ranges, indexes and callbacks selecting columns.
• Rename DataFrame.filter/2 to DataFrame.mask/2.
• Rename Series.filter/2 to Series.mask/2.
• Rename take/2 from both Series and DataFrame to slice/2. slice/2 now they accept ranges as well.
• Raise an error if DataFrame.pivot_wider/4 has float columns as IDs. This is because we can´t
  properly compare floats.
• Change DataFrame.distinct/2 to accept columns as argument instead of receiving it as option.

Fixed

• Ensure that we can compare boolean series in functions like Series.equal/2.
• Fix rename of columns after summarise.
• Fix inspect of float series containing NaN or Infinity values. They are represented as atoms.

Deprecated

• Deprecate DataFrame.filter/2 with a callback in favor of DataFrame.filter_with/2.

v0.2.0

Added

• Consistently support ranges throughout the columns API
• Support negative indexes throughout the columns API
• Integrate with the table package
• Add Series.to_enum/1 for lazily traversing the series
• Add Series.coalesce/1 and Series.coalesce/2 for finding the first non-null value in a list of series

Changed

• Series.length/1 is now Series.size/1 in keeping with Elixir idioms
• Nx is now an optional dependency
• Minimum Elixir version is now 1.13
• DataFrame.to_map/2 is now DataFrame.to_columns/2 and DataFrame.to_series/2
• Rustler is now an optional dependency
• read_ and write_ IO functions are now from_ and to_
• to_binary is now dump_csv
• Now uses polars's "simd" feature
• Now uses polars's "performant" feature
• Explorer.default_backend/0 is now Explorer.Backend.get/0
• Explorer.default_backend/1 is now Explorer.Backend.put/1
• Series.cum_* functions are now Series.cumulative_* to mirror Nx
• Series.rolling_* functions are now Series.window_* to mirror Nx
• reverse? is now an option instead of an argument in Series.cumulative_* functions
• DataFrame.from_columns/2 and DataFrame.from_rows/2 is now DataFrame.new/2
• Rename "col" to "column" throughout the API
• Remove "with_" prefix in options throughout the API
• DataFrame.table/2 accepts options with :limit instead of single integer
• rename/2 no longer accepts a function, use rename_with/2 instead
• rename_with/3 now expects the function as the last argument

Fixed

• Explorer now works on Linux with musl

v0.1.1

This is a security release to address Dependabot security alerts: 1, 2, 3.

v0.1.0

Initial release.