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

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1 : glk 1049 NOTE: GLK's approximate ranking of 5 most important tagged with
2 : glk 962 [GLK:1], [GLK:2], ...
3 :    
4 : glk 1049 ==============================
5 :     other SHORT TERM ============= (including needed for LIC)
6 :     ==============================
7 : glk 781
8 : glk 1049 [GLK:1] Add sequence types (needed for evals & evecs)
9 :     syntax
10 :     types: ty '{' INT '}'
11 :     value construction: '{' e1 ',' … ',' en '}'
12 :     indexing: e '{' e '}'
13 :    
14 : jhr 788 IL support for higher-order tensor values (matrices, etc).
15 : jhr 803 tensor construction [DONE]
16 :     tensor indexing [DONE]
17 :     tensor slicing
18 : jhr 853 verify that hessians work correctly [DONE]
19 : jhr 788
20 :     Use ∇⊗ etc. syntax
21 : jhr 763 syntax [DONE]
22 :     typechecking
23 :     IL and codegen
24 :    
25 : glk 927 test/uninit.diderot:
26 : glk 941 documents need for better compiler error messages when output variables
27 : glk 927 are not initialized; the current messages are very cryptic
28 :    
29 : glk 785 determinant ("det") for tensor[3,3]
30 :    
31 : jhr 788 expand trace in mid to low translation
32 :    
33 :     value-numbering optimization
34 :    
35 :     Add type aliases for color types
36 :     rgb = real{3}
37 :     rgba = real{4}
38 :    
39 : glk 781 ==============================
40 : glk 891 MEDIUM TERM ================== (including needed for streamlines & tractography)
41 : glk 781 ==============================
42 :    
43 : glk 1049 [GLK:1] evals & evecs for symmetric tensor[3,3] (requires sequences)
44 : glk 962
45 : glk 1049 [GLK:2] Save Diderot output to nrrd, instead of "mip.txt"
46 : glk 962 For grid of strands, save to similarly-shaped array
47 :     For list of strands, save to long 1-D (or 2-D for non-scalar output) list
48 :     For ragged things (like tractography output), will need to save both
49 :     complete list of values, as well as list of start indices and lengths
50 :     to index into complete list
51 :    
52 : glk 1049 [GLK:3] Use of Teem's "hest" command-line parser for getting
53 : glk 962 any input variables that are not defined in the source file
54 :    
55 : glk 1049 [GLK:4] ability to declare a field in such a way so that probe
56 : glk 962 positions are *always* clamped to the support of "inside";
57 :     there are many cases where this is the sensible behavior.
58 : glk 1049 (could also have "repeat" declaration, to mimic GL_REPEAT texturing)
59 : glk 962
60 : glk 1049 extend norm (|exp|) to all tensor types [DONE for vectors and matrices]
61 :    
62 : glk 962 ability to emit/track/record variables into dynamically re-sized
63 :     runtime buffer
64 :    
65 : glk 945 Want: allow X *= Y, X /= Y, X += Y, X -= Y to mean what they do in C,
66 :     provided that X*Y, X/Y, X+Y, X-Y are already supported.
67 :     Nearly every Diderot program would be simplified by this.
68 :    
69 : glk 962 Want: non-trivial field expressions & functions:
70 : glk 948 image(2)[2] Vimg = load(...);
71 : glk 950 field#0(2)[] Vlen = |Vimg ⊛ bspln3|;
72 : glk 948 to get a scalar field of vector length, or
73 : glk 950 field#2(2)[] F = Fimg ⊛ bspln3;
74 :     field#0(2)[] Gmag = |∇F|;
75 : glk 948 to get a scalar field of gradient magnitude, or
76 : glk 950 field#2(2)[] F = Fimg ⊛ bspln3;
77 :     field#0(2)[] Gmsq = ∇F•∇F;
78 :     to get a scalar field of squared gradient magnitude, which is simpler
79 : glk 962 to differentiate. However, there is value in having these, even if
80 :     the differentiation of them is not supported (hence the indication
81 :     of "field#0" for these above)
82 : glk 945
83 : glk 962 Want: ability to apply "normalize" to a field itself, e.g.
84 :     field#0(2)[2] V = normalize(Vimg ⊛ ctmr);
85 :     so that V(x) = normalize((Vimg ⊛ ctmr)(x)).
86 :     Having this would simplify expression of standard LIC method, and
87 :     would also help express other vector field expressions that arise
88 :     in vector field feature exraction.
89 : glk 941
90 : glk 781 tensor fields: convolution on general tensor images
91 :    
92 :     ==============================
93 :     other MEDIUM TERM ============ (needed for particles)
94 :     ==============================
95 :    
96 : glk 1049 [GLK:5] run-time death of strands; test/iso2d.diderot provides
97 :     great initial test for "die" command.
98 : glk 781
99 : glk 1049 run-time birth of strands
100 :    
101 : glk 781 "initially" supports lists
102 :    
103 :     "initially" supports lists of positions output from
104 :     different initalization Diderot program
105 :    
106 :     spatial data structure that permits strands' queries of neighbors
107 :    
108 : jhr 784 proper handling of stabilize method
109 :    
110 : glk 891 test/vr-kcomp2.diderot: Add support for code like
111 : jhr 796
112 :     (F1 if x else F2)@pos
113 :    
114 : glk 962 This will require duplication of the continuation of the conditional
115 :     (but we should only duplicate over the live-range of the result of the
116 :     conditional.
117 : jhr 796
118 : glk 1049 add ":" for tensor dot product (contracts out two indices
119 :     instead of one like •), valid for all pairs of tensors with
120 :     at least two indices
121 :    
122 : glk 781 ==============================
123 : jhr 797 other MEDIUM TERM ============
124 :     ==============================
125 :    
126 : glk 927 want: warnings when "D" (reserved for differentiation) is declared as
127 :     a variable name (get confusing error messages now)
128 : jhr 797
129 : jhr 824 support for Python interop and GUI
130 :    
131 : glk 1049 Python/ctypes interface to run-time
132 :    
133 : jhr 797 ==============================
134 : glk 781 LONG TERM ====================
135 :     ==============================
136 :    
137 : glk 927 Better handling of variables that determines the scope of a variable
138 :     based on its actual use, instead of where the user defined it. So,
139 :     for example, we should lift strand-invariant variables to global
140 :     scope. Also prune out useless variables, which should include field
141 :     variables after the translation to mid-il.
142 : jhr 796
143 : glk 781 co- vs contra- index distinction
144 :    
145 :     some indication of tensor symmetry
146 :     (have to identify the group of index permutations that are symmetries)
147 :    
148 :     dot works on all tensors
149 :    
150 :     outer works on all tensors
151 :    
152 :     Einstein summation notation
153 :    
154 :     "tensor comprehension" (like list comprehension)
155 : jhr 784
156 :     ======================
157 :     BUGS =================
158 :     ======================
159 :    
160 : glk 1067 test/bug-lookup.diderot:
161 :     c-target/tree-to-c.sml:42.22-42.63: Fail: lookup(_, l_rayVec_6)
162 :    
163 : glk 1049 test/fields.diderot:
164 :     Can't assign on field to another.
165 : glk 962
166 :     test/read2vecs.diderot:
167 :     // HEY (BUG?) shouldn't it be a type error to load this 2-D array of
168 :     // 2-vectors into a 2-D *scalar* field? Instead, get:
169 :     // uncaught exception Fail [Fail: Error in compiling lic.diderot]
170 :     // raised at driver/main.sml:31.39-31.76
171 :     image(2)[] Vimg = load("../data/vorttest.nrrd");
172 :    
173 : jhr 784 test/zslice2.diderot:
174 :     // HEY (bug) bspln5 leads to problems ...
175 :     // uncaught exception Size [size]
176 :     // raised at c-target/c-target.sml:47.15-47.19
177 :     //field#4(3)[] F = img ⊛ bspln5;

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