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[diderot] Diff of /branches/pure-cfg/TODO
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Diff of /branches/pure-cfg/TODO

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revision 818, Wed Apr 13 18:38:55 2011 UTC revision 1127, Thu May 5 14:06:32 2011 UTC
# Line 1  Line 1 
1  ========================  NOTE: GLK's approximate ranking of 5 most important tagged with
2  SHORT TERM =============  (for curvature-based VR)  [GLK:1], [GLK:2], ...
3  ========================  
4    ==============================
5  want: warnings when D (and likely I) is declared as a  other SHORT TERM =============  (including needed for LIC)
6  variable name (now get confusing error messages now)  ==============================
7    
8  For RGB color output of 2D transfer function (indexed by  Add a clamp function, which takes three arguments; either three scalars:
9  kappa1,kappa2), or for a 1D transfer function, will need    clamp(x, minval, maxval)  = max(minval, min(maxval, x))
10  something akin to convolution on vector images  or three vectors of the same size:
11      clamp([x,y], minvec, maxvec)  = [max(minvec[0], min(maxvec[0], x)),
12                                       max(minvec[1], min(maxvec[1], y))]
13    This would be useful in many current Diderot programs.
14    One question: clamp(x, minval, maxval) is the argument order
15    used in OpenCL and other places, but clamp(minval, maxval, x)
16    would be more consistent with lerp(minout, maxout, x).
17    
18    Level of differentiability in field type should be statement about how
19    much differentiation the program *needs*, rather than what the kernel
20    *provides*.  The needed differentiability can be less than or equal to
21    the provided differentiability.
22    
23    [GLK:1] Add sequence types (needed for evals & evecs)
24        syntax
25            types: ty '{' INT '}'
26            value construction: '{' e1 ',' … ',' en '}'
27            indexing: e '{' e '}'
28    
29  IL support for higher-order tensor values (matrices, etc).  IL support for higher-order tensor values (matrices, etc).
30      tensor construction [DONE]      tensor construction [DONE]
31      tensor indexing [DONE]      tensor indexing [DONE]
32      tensor slicing      tensor slicing
33      verify that hessians work correctly      verify that hessians work correctly [DONE]
   
 Outer products  
     syntax [DONE]  
     typechecking  
     IL and codegen  
   
 Add M dot v, v dot M, and M dot N [DONE]  
   
 Identity matrix [DONE up to code generation]  
   
 trace [DONE]  
   
 extend norm (|exp|) to tensor[3,3]  
34    
35  Use ∇⊗ etc. syntax  Use ∇⊗ etc. syntax
36      syntax [DONE]      syntax [DONE]
37      typechecking      typechecking
38      IL and codegen      IL and codegen
39    
40  Add sequence types  test/uninit.diderot:
41      syntax  documents need for better compiler error messages when output variables
42          types: ty '{' INT '}'  are not initialized; the current messages are very cryptic
         value construction: '{' e1 ',' … ',' en '}'  
         indexing: e '{' e '}'  
   
 Infix dot product and cross product [DONE]  
   
 lerp on scalars and vectors [DONE]  
   
 ==============================  
 other SHORT TERM =============  (including needed for LIC)  
 ==============================  
43    
44  determinant ("det") for tensor[3,3]  determinant ("det") for tensor[3,3]
45    
 Decide if we want to allow redefinitions of variables  
   (as in vr-lite-cam.diderot)  
   
 extend norm (|exp|) to all tensor types  
   
 extend normalize to all tensor types  
   
 vector fields: convolution on vector images  
   
46  expand trace in mid to low translation  expand trace in mid to low translation
47    
48  value-numbering optimization  value-numbering optimization
# Line 67  Line 52 
52      rgba = real{4}      rgba = real{4}
53    
54  ==============================  ==============================
55  MEDIUM TERM ================== (needed for streamlines & tractography)  MEDIUM TERM ================== (including needed for streamlines & tractography)
56  ==============================  ==============================
57    
58    [GLK:1] evals & evecs for symmetric tensor[3,3] (requires sequences)
59    
60    [GLK:2] Save Diderot output to nrrd, instead of "mip.txt"
61      For grid of strands, save to similarly-shaped array
62      For list of strands, save to long 1-D (or 2-D for non-scalar output) list
63      For ragged things (like tractography output), will need to save both
64        complete list of values, as well as list of start indices and lengths
65        to index into complete list
66    
67    [GLK:3] Use of Teem's "hest" command-line parser for getting
68    any input variables that are not defined in the source file
69    
70    [GLK:4] ability to declare a field so that probe positions are
71    *always* "inside"; with various ways of mapping the known image values
72    to non-existant index locations.  One possible syntax emphasizes that
73    there is a index mapping function that logically precedes convolution:
74      F = bspln3 ⊛ (img ◦ clamp)
75      F = bspln3 ⊛ (img ◦ repeat)
76      F = bspln3 ⊛ (img ◦ mirror)
77    where "◦" or "∘" is used to indicate function composition
78    
79    extend norm (|exp|) to all tensor types [DONE for vectors and matrices]
80    
81  ability to emit/track/record variables into dynamically re-sized  ability to emit/track/record variables into dynamically re-sized
82  runtime buffer  runtime buffer
83    
84  evals & evecs for symmetric tensor[3,3]  Want: allow X *= Y, X /= Y, X += Y, X -= Y to mean what they do in C,
85    provided that X*Y, X/Y, X+Y, X-Y are already supported.
86    Nearly every Diderot program would be simplified by this.
87    
88    Want: non-trivial field expressions & functions:
89      image(2)[2] Vimg = load(...);
90      field#0(2)[] Vlen = |Vimg ⊛ bspln3|;
91    to get a scalar field of vector length, or
92      field#2(2)[] F = Fimg ⊛ bspln3;
93      field#0(2)[] Gmag = |∇F|;
94    to get a scalar field of gradient magnitude, or
95      field#2(2)[] F = Fimg ⊛ bspln3;
96      field#0(2)[] Gmsq = ∇F•∇F;
97    to get a scalar field of squared gradient magnitude, which is simpler
98    to differentiate.  However, there is value in having these, even if
99    the differentiation of them is not supported (hence the indication
100    of "field#0" for these above)
101    
102    Want: ability to apply "normalize" to a field itself, e.g.
103      field#0(2)[2] V = normalize(Vimg ⊛ ctmr);
104    so that V(x) = normalize((Vimg ⊛ ctmr)(x)).
105    Having this would simplify expression of standard LIC method, and
106    would also help express other vector field expressions that arise
107    in vector field feature exraction.
108    
109  tensor fields: convolution on general tensor images  tensor fields: convolution on general tensor images
110    
# Line 81  Line 112 
112  other MEDIUM TERM ============ (needed for particles)  other MEDIUM TERM ============ (needed for particles)
113  ==============================  ==============================
114    
115  run-time birth and death of strands  [GLK:5] run-time death of strands; test/iso2d.diderot provides
116    great initial test for "die" command.
117    
118    Put small 1-D and 2-D fields, when reconstructed specifically by tent
119    and when differentiation is not needed, into faster texture buffers.
120    test/illust-vr.diderot is good example of program that uses multiple
121    such 1-D fields basically as lookup-table-based function evaluation
122    
123    run-time birth of strands
124    
125  "initially" supports lists  "initially" supports lists
126    
# Line 92  Line 131 
131    
132  proper handling of stabilize method  proper handling of stabilize method
133    
134  Add support for code like  test/vr-kcomp2.diderot: Add support for code like
135    
136          (F1 if x else F2)@pos          (F1 if x else F2)@pos
137    
138  This will require duplication of the continuation of the conditional (but we should only  This will require duplication of the continuation of the conditional
139  duplicate over the live-range of the result of the conditional.  (but we should only duplicate over the live-range of the result of the
140    conditional.
141    
142    add ":" for tensor dot product (contracts out two indices
143    instead of one like •), valid for all pairs of tensors with
144    at least two indices
145    
146  ==============================  ==============================
147  other MEDIUM TERM ============  other MEDIUM TERM ============
148  ==============================  ==============================
149    
150  support fog Python interop and GUI  want: warnings when "D" (reserved for differentiation) is declared as
151    a variable name (get confusing error messages now)
152    
153    support for Python interop and GUI
154    
155    Python/ctypes interface to run-time
156    
157  ==============================  ==============================
158  LONG TERM ====================  LONG TERM ====================
159  ==============================  ==============================
160    
161  Better handling of variables that determines the scope of a variable based on its actual use,  Better handling of variables that determines the scope of a variable
162  instead of where the user defined it.  So, for example, we should lift strand-invariant variables  based on its actual use, instead of where the user defined it.  So,
163  to global scope.  Also prune out useless variables, which should include field variables after the  for example, we should lift strand-invariant variables to global
164  translation to mid-il.  scope.  Also prune out useless variables, which should include field
165    variables after the translation to mid-il.
166    
167  co- vs contra- index distinction  co- vs contra- index distinction
168    
 add ":" for tensor dot product (contracts out two indices  
 instead of one like •), valid for all pairs of tensors with  
 at least two indices  
   
169  some indication of tensor symmetry  some indication of tensor symmetry
170  (have to identify the group of index permutations that are symmetries)  (have to identify the group of index permutations that are symmetries)
171    
# Line 131  Line 177 
177    
178  "tensor comprehension" (like list comprehension)  "tensor comprehension" (like list comprehension)
179    
 Python/ctypes interface to run-timez  
   
180  ======================  ======================
181  BUGS =================  BUGS =================
182  ======================  ======================
183    
184  test/mip-cam.diderot:  test/read2vecs.diderot:
185      // generated C code looks like "(float)p_ui_0--0.5e0f"  // HEY (BUG?) shouldn't it be a type error to load this 2-D array of
186      //real rayU = 2.0*camUmax*(real(ui) - -0.5)/real(imgResU) - camUmax;  // 2-vectors into a 2-D *scalar* field?  Instead, get:
187    //   uncaught exception Fail [Fail: Error in compiling lic.diderot]
188  test/vr-kcomp.diderot:  //     raised at driver/main.sml:31.39-31.76
189      // HEY (scoping BUG): the strand parameters (e.g. ui, vi) ...  image(2)[] Vimg = load("../data/vorttest.nrrd");
   
 test/zslice2.diderot:  
 // but is this not valid syntax for creating field in one shot?  
 //field#2(3)[] F = (load("../data/zimg112.nrrd")) ⊛ bspln3;  
 // It is valid syntax, but there is a bug in the conversion from HighIL to MidIL  
190    
191  test/zslice2.diderot:  test/zslice2.diderot:
192  // HEY (bug) bspln5 leads to problems ...  // HEY (bug) bspln5 leads to problems ...
193  //  uncaught exception Size [size]  //  uncaught exception Size [size]
194  //    raised at c-target/c-target.sml:47.15-47.19  //    raised at c-target/c-target.sml:47.15-47.19
195  //field#4(3)[] F = img ⊛ bspln5;  //field#4(3)[] F = img ⊛ bspln5;
   
   

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