Why TypeError: 'float' object cannot be interpreted as an index ?

[hl-henry]

Macintosh# python financeInference.py
left timesteps: = 3
right timesteps: = 13
Use perturbation node penalty function
number of samples per time: 3
lambda = 0.18, beta = 13
analyze stock data
Distributed ADMM (4 processors)
Iteration 1
Traceback (most recent call last):
File "financeInference.py", line 417, in
gvx, empCov_set = solveProblem(gvx, index_penalty, cov_mode, alpha, beta, timesteps, timeShift, Cov_set, use_kernel, sigma, sample_set, empCov_set, eps_abs, eps_rel)
File "financeInference.py", line 327, in solveProblem
gvx.Solve(EpsAbs=eps_abs, EpsRel=eps_rel,Verbose=True,MaxIters=500)
File "/private/var/root/TVGL/PaperCode/inferGraphPN.py", line 147, in Solve
Verbose)
File "/private/var/root/TVGL/PaperCode/inferGraphPN.py", line 437, in __SolveADMM
pool.map(ADMM_x, node_list)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/pool.py", line 251, in map
return self.map_async(func, iterable, chunksize).get()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/pool.py", line 567, in get
raise self._value
TypeError: 'float' object cannot be interpreted as an index