Taichi

Highlights:
- **Error messages**
- Use print directly instead of builtin warnings module (1969) (by **彭于斌**)
- **Metal backend**
- Support assert() (1959) (by **Ye Kuang**)
- **Type system**
- Remove LegacyVectorType (1967) (by **Jiafeng Liu**)
- Make PrimitiveTypeID a public enum (1965) (by **Xuanda Yang**)
- Make TypeFactory Global (1963) (by **Jiafeng Liu**)
- Adopt the new type system in Stmt (1957) (by **Yuanming Hu**)

Full changelog:
- [Error] [ipython] Use print directly instead of builtin warnings module (1969) (by **彭于斌**)
- [Type] [refactor] Remove LegacyVectorType (1967) (by **Jiafeng Liu**)
- [windows] [gui] Support ti.GUI(fast_gui=True) on Win32 (1953) (by **彭于斌**)
- [Type] [refactor] Make PrimitiveTypeID a public enum (1965) (by **Xuanda Yang**)
- [misc] Set CMAKE_CXX_STANDARD to 17 (1964) (by **xumingkuan**)
- [Type] [refactor] Make TypeFactory Global (1963) (by **Jiafeng Liu**)
- [type] Remove DataType::width (1962) (by **Yuanming Hu**)
- [Metal] Support assert() (1959) (by **Ye Kuang**)
- [type] [refactor] Remove DataType::data_type (1960) (by **Taichi Gardener**)
- [Type] Adopt the new type system in Stmt (1957) (by **Yuanming Hu**)

More details on the v0.7 changes will be posted later.

Highlights:
- **Bug fixes**
- Fix error when subscripting a dict (1950) (by **彭于斌**)
- "ext_arr.shape" should return "ti.Expr" instead of "ti.core.Expr" (1939) (by **彭于斌**)
- **GUI**
- Support "ti.GUI(fast_gui=True)" for zero-copy while gui.set_image(img) (1922) (by **彭于斌**)
- **Metal backend**
- Support ti.block_dim() and ti.cfg.saturating_grid_dim (1947) (by **Ye Kuang**)
- **Performance improvements**
- Support thread local storage for reduction in struct-fors (1941) (by **Yuanming Hu**)

Full changelog:
- [Bug] [lang] Fix error when subscripting a dict (1950) (by **彭于斌**)
- [refactor] Add format_error_message() method (1955) (by **Ye Kuang**)
- [async] Use llvm::SmallVector/llvm:SmallSet for latest state readers (1951) (by **Ye Kuang**)
- [metal] Support TLS for struct-for tasks (1949) (by **Ye Kuang**)
- [Metal] Support ti.block_dim() and ti.cfg.saturating_grid_dim (1947) (by **Ye Kuang**)
- [type] Add basic implementations of VectorType and PointerType (1948) (by **Yuanming Hu**)
- [refactor] Move OffloadedStmt::TaskType to a separate file (1946) (by **xumingkuan**)
- [Bug] [lang] "ext_arr.shape" should return "ti.Expr" instead of "ti.core.Expr" (1939) (by **彭于斌**)
- [Perf] Support thread local storage for reduction in struct-fors (1941) (by **Yuanming Hu**)
- [async] Do not keep latest state readers in SFG (1945) (by **xumingkuan**)
- [refactor] VectorType -> LegacyVectorType (1943) (by **Taichi Gardener**)
- [refactor] Remove obsolete AsyncEngine::fuse() (1944) (by **Taichi Gardener**)
- [type] Initial TypeFactory class (1942) (by **Yuanming Hu**)
- [GUI] [linux] Support "ti.GUI(fast_gui=True)" for zero-copy while gui.set_image(img) (1922) (by **彭于斌**)
- [misc] Add misc/fetch_active_contributor.py (1938) (by **Yuanming Hu**)

Highlights:
- **GUI**
- Support creating fullscreen window by "ti.GUI(fullscreen=True)" (1921) (by **彭于斌**)

Full changelog:
- [misc] Add a link to TaichiHub playground in README.md (1933) (by **彭于斌**)
- [test] Add a benchmark for SFG edges' two-level map (1927) (by **Ye Kuang**)
- [async] Switch to llvm::SmallVector<llvm::SmallSet> for edges (1936) (by **Ye Kuang**)
- [async] [opt] Field value killing analysis (1929) (by **xumingkuan**)
- [ir] Add the case of bit_shr to binary_op_type_symbol (1930) (by **xumingkuan**)
- [GUI] [linux] Support creating fullscreen window by "ti.GUI(fullscreen=True)" (1921) (by **彭于斌**)

Full changelog:
- [refactor] Use PrimitiveType::type instead of DataType::type (1926) (by **Taichi Gardener**)
- [example] Upgrade mass_spring_3d.py to Taichi THREE v0.0.5 (1919) (by **彭于斌**)
- [async] [metal] Support async mode on Metal (1920) (by **Ye Kuang**)
- [type] [refactor] Promote DataType to a class (1906) (by **Yuanming Hu**)
- [async] Partial SFG node GC (keep latest state writers/readers) (1915) (by **xumingkuan**)
- [doc] Improve description of the pos parameter in gui (1904) (by **qbao0x3273**)

Highlights:
- **Examples**
- Fix rounding error for cornell_box.py (1908) (by **蕉太狼**)
- **Language and syntax**
- Add ti.materialize_callback for functions to be called right after root materialization (1912) (by **彭于斌**)

Full changelog:
- [doc] Guard values with "ti.approx" in "docs/write_test.rst" to allow FP-error tolerance (1911) (by **Tony**)
- [Lang] Add ti.materialize_callback for functions to be called right after root materialization (1912) (by **彭于斌**)
- [metal] Fix error message (1916) (by **Ye Kuang**)
- [async] Support SFG-level DSE for scalar SNodes (1907) (by **Ye Kuang**)
- [Example] Fix rounding error for cornell_box.py (1908) (by **蕉太狼**)
- [async] Add advection benchmark (1914) (by **Yuanming Hu**)
- [example] Update mpm_lagrangian_forces.py (1910) (by **Yuanming Hu**)
- [doc] Use "atan2(y, x)" instead of "atan2(x, y)" (1816) (1903) (by **Tony**)
- [metal] Add KernelManagerData in prep for pointer SNode (1895) (by **Ye Kuang**)
- [perf] Wrap clear loss/grad into a kernel (1902) (by **Ye Kuang**)

Highlights:
- **Intermediate representation**
- Support SHR operator: ti.bit_shr(x, y) (1871) (by **Xuanda Yang**)
- **Miscellaneous**
- Automatic release pipeline: read semver from CMakeList directly (1885) (by **Chengchen(Rex) Wang**)
- **Refactor**
- Move statements from ir.h to statements.h (1898) (by **xumingkuan**)

Full changelog:
- [bug] Fix stable fluid BFECC advection (1764) (by **Yadi Cao**)
- [Refactor] [ir] Move statements from ir.h to statements.h (1898) (by **xumingkuan**)
- [export] Support exporting custom config variables (1893) (by **彭于斌**)
- [gui] [ipython] Add GUI.__del__ to close on variable dereference (1869) (by **彭于斌**)
- [misc] Make check previous CI run only check for Build-and-Test jobs (1899) (by **Ye Kuang**)
- [refactor] Move IRBank to a separate file (1897) (by **xumingkuan**)
- [refactor] Remove DFS in DOT generation (1896) (by **Ye Kuang**)
- [async] Optimize StateFlowGraph::optimize_listgen (1894) (by **Yuanming Hu**)
- [misc] Expose kernel statistics to python (1891) (by **Ye Kuang**)
- [async] Cache demote_activation (1889) (by **xumingkuan**)
- [async] Make optimization passes iterative (1890) (by **Ye Kuang**)
- [async] Remove ClearListStmt from possibly fused serial tasks (1888) (by **Ye Kuang**)
- [IR] [lang] Support SHR operator: ti.bit_shr(x, y) (1871) (by **Xuanda Yang**)
- [async] Classify tasks to make fusion 10.6x faster (1887) (by **xumingkuan**)
- [Misc] Automatic release pipeline: read semver from CMakeList directly (1885) (by **Chengchen(Rex) Wang**)
- [export] [cc] Support ti.RecordGroupHint to group launched kernels (1880) (by **彭于斌**)
- [async] Add element-wise info into TaskMeta for fusion (1884) (by **xumingkuan**)