## Uses of Class
org.apache.sysds.hops.ipa.IPAPass

- Packages that use IPAPass
  Package | Description
  --- | ---
  org.apache.sysds.hops.ipa |

- - ### Uses of IPAPass in org.apache.sysds.hops.ipa

    Subclasses of IPAPass in org.apache.sysds.hops.ipa
    Modifier and Type | Class and Description
    --- | ---
    `class` | `IPAPassApplyStaticAndDynamicHopRewrites` This rewrite applies static hop dag and statement block rewrites such as constant folding and branch removal in order to simplify statistic propagation.
    `class` | `IPAPassCompressionWorkloadAnalysis` This rewrite obtains workload summaries for all hops candidates amenable for compression as a basis for workload-aware compression planning.
    `class` | `IPAPassEliminateDeadCode` This rewrite eliminates unnecessary sub-DAGs that produce transient write outputs which are never consumed subsequently.
    `class` | `IPAPassFlagFunctionsRecompileOnce` This rewrite marks functions with loops as recompile once in order to reduce recompilation overhead.
    `class` | `IPAPassFlagNonDeterminism`
    `class` | `IPAPassForwardFunctionCalls` This rewrite forwards a function call to a function with a simple function call that only consumes function parameters and literals into the original call location.
    `class` | `IPAPassInlineFunctions` This rewrite inlines single statement block functions, which have fewer operations than an internal threshold.
    `class` | `IPAPassPropagateReplaceLiterals` This rewrite propagates and replaces literals into functions in order to enable subsequent rewrites such as branch removal.
    `class` | `IPAPassRemoveConstantBinaryOps` This rewrite identifies binary operations with constant matrices such as X * ones, where ones might be created as a vector of ones before a loop.
    `class` | `IPAPassRemoveUnnecessaryCheckpoints` This rewrite identifies and removes unnecessary checkpoints, i.e., persisting of Spark RDDs into a given storage level.
    `class` | `IPAPassRemoveUnusedFunctions` This rewrite identifies and removes unused functions in order to reduce compilation overhead and other overheads such as parfor worker creation, where we construct function copies.

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